feat: add duplicate folder detection and /duplicate-folders API endpoint

- Add DuplicateFolderGroup and DuplicateFoldersResponse Pydantic models
- Add /duplicate-folders GET endpoint for listing pre-existing duplicates
- Add _scan_for_pre_existing_duplicates() function for NFO-based detection
- Add _try_merge_duplicate_group() for auto-merging empty/symlink-only duplicates
- Integrate duplicate detection into validate_and_rename_series_folders workflow
- Skip rename for flagged duplicates to prevent data loss during merge

src/server/api/anime.py

@@ -1,12 +1,13 @@
 import logging
 import warnings
+from pathlib import Path
 from typing import Any, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from pydantic import BaseModel, Field, field_validator
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from src.core.entities.series import Serie
+from src.config.settings import settings
 from src.core.utils.key_utils import generate_key_from_folder, is_valid_key
 from src.server.database.service import AnimeSeriesService
 from src.server.exceptions import (
@@ -26,6 +27,9 @@ from src.server.utils.dependencies import (
 )
 from src.server.utils.filesystem import sanitize_folder_name
 from src.server.utils.validators import validate_filter_value, validate_search_query
+from src.server.services.folder_rename_service import (
+    _scan_for_pre_existing_duplicates,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -71,6 +75,100 @@ async def get_anime_status(
         ) from exc
 
 
+class DuplicateFolderGroup(BaseModel):
+    """A group of duplicate folders for the same series.
+
+    Attributes:
+        key: Series key (provider-assigned unique identifier)
+        folders: List of folder names that are duplicates
+        folder_count: Number of duplicate folders
+    """
+    key: str = Field(..., description="Series key (unique identifier)")
+    folders: List[str] = Field(..., description="List of duplicate folder names")
+    folder_count: int = Field(..., description="Number of duplicate folders")
+
+
+class DuplicateFoldersResponse(BaseModel):
+    """Response model for duplicate folders listing.
+
+    Attributes:
+        total_groups: Total number of duplicate groups found
+        duplicate_groups: List of duplicate folder groups
+        message: Human-readable summary
+    """
+    total_groups: int = Field(..., description="Total number of duplicate groups")
+    duplicate_groups: List[DuplicateFolderGroup] = Field(
+        ..., description="List of duplicate folder groups"
+    )
+    message: str = Field(..., description="Human-readable summary")
+
+
+@router.get("/duplicate-folders", response_model=DuplicateFoldersResponse)
+async def get_duplicate_folders(
+    _auth: dict = Depends(require_auth),
+) -> DuplicateFoldersResponse:
+    """List all pre-existing duplicate folder groups.
+
+    Scans the anime directory for folders with tvshow.nfo files that
+    map to the same series key. Returns groups of duplicates for
+    manual review and cleanup.
+
+    Returns:
+        DuplicateFoldersResponse with groups of duplicate folders
+
+    Note:
+        Not all duplicate folders are safe to merge - some may belong
+        to different releases (e.g., dubbed vs. subbed). Review carefully
+        before taking action.
+    """
+    try:
+        if not settings.anime_directory:
+            return DuplicateFoldersResponse(
+                total_groups=0,
+                duplicate_groups=[],
+                message="Anime directory not configured",
+            )
+
+        anime_dir = Path(settings.anime_directory)
+        if not anime_dir.is_dir():
+            return DuplicateFoldersResponse(
+                total_groups=0,
+                duplicate_groups=[],
+                message=f"Anime directory not found: {anime_dir}",
+            )
+
+        duplicates = _scan_for_pre_existing_duplicates(anime_dir)
+
+        groups = [
+            DuplicateFolderGroup(
+                key=dup.key,
+                folders=dup.folders,
+                folder_count=dup.count,
+            )
+            for dup in duplicates
+        ]
+
+        if groups:
+            message = (
+                f"Found {len(groups)} duplicate group(s). "
+                "Review carefully - some duplicates may be different releases "
+                "(e.g., dubbed vs. subbed)."
+            )
+        else:
+            message = "No duplicate folders found."
+
+        return DuplicateFoldersResponse(
+            total_groups=len(groups),
+            duplicate_groups=groups,
+            message=message,
+        )
+    except Exception as exc:
+        logger.error("Failed to scan for duplicate folders: %s", str(exc))
+        raise ServerError(
+            message=f"Failed to scan for duplicates: {str(exc)}"
+        ) from exc
+
+
 class AnimeSummary(BaseModel):
     """Summary of an anime series with missing episodes.
     

src/server/services/folder_rename_service.py

@@ -13,8 +13,9 @@ reflect the new paths.
 from __future__ import annotations
 
 import logging
+from collections import defaultdict
 from pathlib import Path
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Optional, Set, Tuple
 
 from lxml import etree
 
@@ -34,6 +35,141 @@ logger = logging.getLogger(__name__)
 INVALID_PATH_CHARS = '<>:"/\\|?*\x00'
 
 
+class DuplicateGroup:
+    """Represents a group of duplicate folders for the same series.
+
+    Attributes:
+        key: The series key (folder name before rename).
+        folders: List of folder paths that map to this series.
+        nfo_paths: List of corresponding NFO file paths.
+    """
+
+    def __init__(self, key: str, folders: List[str], nfo_paths: List[Path]):
+        self.key = key
+        self.folders = folders
+        self.nfo_paths = nfo_paths
+
+    @property
+    def count(self) -> int:
+        return len(self.folders)
+
+    def __repr__(self) -> str:
+        return f"DuplicateGroup(key={self.key!r}, folders={self.folders})"
+
+
+def _scan_for_pre_existing_duplicates(anime_dir: Path) -> List[DuplicateGroup]:
+    """Scan anime directory for pre-existing duplicate folders.
+
+    Groups folders by the series key extracted from their NFO files.
+    Folders with the same title+year (same expected name) are flagged as duplicates.
+
+    Args:
+        anime_dir: Path to the anime directory to scan.
+
+    Returns:
+        List of DuplicateGroup objects, one per series with duplicate folders.
+    """
+    # Group folders by their expected name (title+year from NFO)
+    groups: Dict[str, List[Tuple[str, Path]]] = defaultdict(list)
+
+    for series_dir in anime_dir.iterdir():
+        if not series_dir.is_dir():
+            continue
+        nfo_path = series_dir / "tvshow.nfo"
+        if not nfo_path.exists():
+            continue
+        title, year = _parse_nfo_title_and_year(nfo_path)
+        if not title or not year:
+            continue
+        expected_name = _compute_expected_folder_name(title, year)
+        groups[expected_name].append((series_dir.name, nfo_path))
+
+    # Filter to only groups with more than one folder
+    duplicates = []
+    for key, items in groups.items():
+        if len(items) > 1:
+            folders = [item[0] for item in items]
+            nfo_paths = [item[1] for item in items]
+            duplicates.append(DuplicateGroup(key=key, folders=folders, nfo_paths=nfo_paths))
+
+    return duplicates
+
+
+def _try_merge_duplicate_group(group: DuplicateGroup, dry_run: bool = False) -> bool:
+    """Attempt to merge a duplicate group automatically.
+
+    Uses the first folder as the canonical one and removes others if they are
+    empty or contain only symlinks.
+
+    Args:
+        group: The DuplicateGroup to merge.
+        dry_run: If True, only log actions without executing them.
+
+    Returns:
+        True if merge was successful, False otherwise.
+    """
+    if len(group.folders) < 2:
+        return True
+
+    # Keep first folder as canonical, mark others for removal
+    canonical = group.folders[0]
+    to_remove = group.folders[1:]
+
+    for folder in to_remove:
+        folder_path = group.nfo_paths[0].parent.parent / folder  # same parent dir
+        if not folder_path.exists():
+            continue
+
+        # Check if folder is empty or only has symlinks
+        try:
+            contents = list(folder_path.iterdir())
+        except PermissionError:
+            logger.warning("Permission denied accessing %s, skip merge", folder_path)
+            return False
+        except OSError:
+            return False
+
+        if not contents:
+            # Empty folder - safe to remove
+            if dry_run:
+                logger.info("[DRY-RUN] Would delete empty duplicate folder: %s", folder_path)
+            else:
+                try:
+                    folder_path.rmdir()
+                    logger.info("Deleted empty duplicate folder: %s", folder_path)
+                except OSError:
+                    return False
+            continue
+
+        # Check if all contents are symlinks pointing to canonical
+        all_symlinks = all(
+            item.is_symlink() and item.resolve() == (folder_path.parent / canonical).resolve()
+            for item in contents
+        )
+        if all_symlinks:
+            if dry_run:
+                logger.info("[DRY-RUN] Would remove symlinks in duplicate folder: %s", folder_path)
+            else:
+                for item in contents:
+                    item.unlink()
+                try:
+                    folder_path.rmdir()
+                    logger.info("Removed symlink-only duplicate folder: %s", folder_path)
+                except OSError:
+                    return False
+            continue
+
+        # Cannot auto-merge - requires manual intervention
+        logger.warning(
+            "Cannot auto-merge duplicate folders for '%s': %s (manual merge required)",
+            group.key,
+            [canonical] + to_remove,
+        )
+        return False
+
+    return True
+
+
 def _parse_nfo_title_and_year(nfo_path: Path) -> Tuple[Optional[str], Optional[str]]:
     """Parse a tvshow.nfo and return (title, year) text values.
 
@@ -383,6 +519,28 @@ async def validate_and_rename_series_folders(dry_run: bool = False) -> Dict[str,
 
     stats = {"scanned": 0, "renamed": 0, "skipped": 0, "errors": 0}
 
+    # Detect pre-existing duplicates before rename loop
+    pre_existing_duplicates: Set[str] = set()
+    duplicates = _scan_for_pre_existing_duplicates(anime_dir)
+    for dup_group in duplicates:
+        # Try automatic merge first
+        if _try_merge_duplicate_group(dup_group, dry_run=dry_run):
+            logger.info(
+                "Auto-merged duplicate group for '%s' (%d folders)",
+                dup_group.key,
+                dup_group.count,
+            )
+        else:
+            # Flag all folders in this group as pre-existing duplicates
+            for folder in dup_group.folders:
+                pre_existing_duplicates.add(folder)
+            logger.warning(
+                "Duplicate folders detected for series '%s': %s — "
+                "manual cleanup required (different releases or non-empty duplicates)",
+                dup_group.key,
+                dup_group.folders,
+            )
+
     for series_dir in sorted(anime_dir.iterdir()):
         if not series_dir.is_dir():
             continue
@@ -422,6 +580,15 @@ async def validate_and_rename_series_folders(dry_run: bool = False) -> Dict[str,
 
         expected_path = anime_dir / expected_name
 
+        # Check for pre-existing duplicate
+        if current_name in pre_existing_duplicates:
+            logger.warning(
+                "Skipping rename for '%s' — pre-existing duplicate folder detected",
+                current_name,
+            )
+            stats["errors"] += 1
+            continue
+
         # Check for duplicate target
         if expected_path.exists():
             logger.warning(