perf: use local volume for Pinchflat downloads instead of WebDAV

The HiDrive WebDAV mount was causing severe performance issues:
- High latency for directory listings and file checks
- Slow UI page loads (multi-second delays)
- Database query idle times of 600-1600ms

Changed to use local Docker volume for /downloads, which provides:
- Fast filesystem operations
- Responsive UI
- No database connection delays

Note: Downloads are now stored locally. Set up rsync/rclone
to sync to HiDrive if remote storage is needed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

media/compose.yaml

@@ -70,10 +70,9 @@ services:
     restart: unless-stopped
     volumes:
       - pinchflat_config:/config
-      - /mnt/hidrive/users/valknar/Downloads/pinchflat:/downloads
+      - pinchflat_downloads:/downloads
     environment:
       TZ: ${TIMEZONE:-Europe/Berlin}
-      JOURNAL_MODE: delete
     networks:
       - compose_network
     labels:
@@ -104,6 +103,8 @@ volumes:
     name: ${MEDIA_COMPOSE_PROJECT_NAME}_filestash_data
   pinchflat_config:
     name: ${MEDIA_COMPOSE_PROJECT_NAME}_pinchflat_config
+  pinchflat_downloads:
+    name: ${MEDIA_COMPOSE_PROJECT_NAME}_pinchflat_downloads
 
 networks:
   compose_network: