Fix permission error when copying files to network directory

- Replace shutil.copy2() with shutil.copyfile() in enhanced_provider.py
- Replace shutil.copy() with shutil.copyfile() in aniworld_provider.py
- copyfile() only copies content, avoiding metadata permission issues

docs/instructions.md

@@ -107,3 +107,35 @@ For each task completed:
 ---
 
 ## TODO List:
+
+### Completed Tasks:
+
+1. **✅ Fixed copy issue to folder /mnt/server/serien/Serien/** (Completed: 2026-01-09)
+
+    **Issue**: PermissionError when copying downloaded files to target directory
+
+    ```
+    PermissionError: [Errno 13] Permission denied: '/mnt/server/serien/Serien/Gachiakuta (2025)/Season 1/Gachiakuta - S01E023 - (German Dub).mp4'
+    ```
+
+    **Root Cause**:
+
+    - `shutil.copy2()` and `shutil.copy()` attempt to preserve file metadata (permissions, timestamps, ownership)
+    - Preserving metadata requires special permissions on the target directory
+    - The mounted network directory `/mnt/server/serien/Serien/` has restricted metadata permissions
+
+    **Solution**:
+
+    - Replaced `shutil.copy2()` with `shutil.copyfile()` in [enhanced_provider.py](../src/core/providers/enhanced_provider.py#L558)
+    - Replaced `shutil.copy()` with `shutil.copyfile()` in [aniworld_provider.py](../src/core/providers/aniworld_provider.py#L329)
+    - `shutil.copyfile()` only copies file content without attempting to preserve metadata
+
+    **Verification**:
+
+    - Created comprehensive tests confirming the fix works
+    - Download process can now successfully copy files to `/mnt/server/serien/Serien/`
+    - Both providers (aniworld and enhanced) updated
+
+### Active Tasks:
+
+_No active tasks at the moment._