feat(setup): separate NFO scan into dedicated phase

- Add /nfo-scan-phase endpoint to trigger NFO scan independently
- Move NFO scan out of initial setup into separate post-unresolved phase
- Add phase query param handling for /loading page (?phase=initial, ?phase=nfo)
- Update setup redirect middleware to handle phase-based redirects
- Update auth setup to pass phase=initial to loading page

src/server/services/initialization_service.py

@@ -386,8 +386,8 @@ async def perform_initial_setup(progress_service=None):
         # Load series into memory from database
         await _load_series_into_memory(progress_service)
 
-        # Run NFO scan as part of initialization
-        await perform_nfo_scan_if_needed(progress_service)
+        # NOTE: NFO scan is NO longer run here - it runs in a separate phase
+        # after unresolved folders are completed (via /loading?phase=nfo)
 
         return True
 
@@ -534,6 +534,82 @@ async def perform_nfo_scan_if_needed(progress_service=None):
             )
 
 
+async def perform_nfo_scan_phase(progress_service=None):
+    """Perform the NFO scan phase as part of the second loading page phase.
+    
+    This is called when the loading page is accessed with ?phase=nfo query param.
+    It runs the NFO scan and emits progress updates via the progress service.
+    
+    Args:
+        progress_service: Optional ProgressService for emitting updates
+    """
+    logger.info("Starting NFO scan phase...")
+    
+    if progress_service:
+        from src.server.services.progress_service import ProgressType
+        await progress_service.start_progress(
+            progress_id="nfo_scan",
+            progress_type=ProgressType.SCAN,
+            title="Scanning NFO Files",
+            total=100,
+            message="Starting NFO scan...",
+            metadata={"step_id": "nfo_scan", "phase": "nfo"}
+        )
+    
+    # Check if NFO scan was already completed
+    is_nfo_scan_done = await _check_nfo_scan_status()
+    
+    # Check if NFO features are configured
+    if not await _is_nfo_scan_configured():
+        message = (
+            "Skipped - TMDB API key not configured"
+            if not settings.tmdb_api_key
+            else "Skipped - NFO features disabled"
+        )
+        logger.info("NFO scan phase skipped: %s", message)
+        
+        if progress_service:
+            await progress_service.complete_progress(
+                progress_id="nfo_scan",
+                message=message,
+                metadata={"step_id": "nfo_scan", "phase": "nfo", "nfo_scan_complete": True}
+            )
+        return
+    
+    # Skip if already completed
+    if is_nfo_scan_done:
+        logger.info("Skipping NFO scan phase - already completed on previous run")
+        if progress_service:
+            await progress_service.complete_progress(
+                progress_id="nfo_scan",
+                message="Already completed",
+                metadata={"step_id": "nfo_scan", "phase": "nfo", "nfo_scan_complete": True}
+            )
+        return
+    
+    # Execute the NFO scan
+    try:
+        await _execute_nfo_scan(progress_service)
+        await _mark_nfo_scan_completed()
+        
+        # Send completion event
+        if progress_service:
+            await progress_service.complete_progress(
+                progress_id="nfo_scan",
+                message="NFO scan completed successfully",
+                metadata={"step_id": "nfo_scan", "phase": "nfo", "nfo_scan_complete": True}
+            )
+        logger.info("NFO scan phase completed successfully")
+    except Exception as e:
+        logger.error("Failed to complete NFO scan phase: %s", e, exc_info=True)
+        if progress_service:
+            await progress_service.fail_progress(
+                progress_id="nfo_scan",
+                error_message=f"NFO scan failed: {str(e)}",
+                metadata={"step_id": "nfo_scan", "phase": "nfo"}
+            )
+
+
 async def _check_media_scan_status() -> bool:
     """Check if initial media scan has been completed.