Add category filtering, default to copy mode, split dev/prod compose

- Default MOVE_MODE changed to copy so qBit can continue seeding
- Add QBIT_CATEGORY env var (default "Stash") to filter torrents
- Split compose into dev (build from source) and prod (pre-built image)
- Fix Dockerfile COPY glob needing trailing slash
- Update README and summary docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

stash_handler.py

@@ -31,7 +31,8 @@ def load_config():
             os.environ.get("MEDIA_EXTENSIONS", DEFAULT_MEDIA_EXTENSIONS).split(",")
         ),
         "hash_algorithm": os.environ.get("HASH_ALGORITHM", "sha256"),
-        "move_mode": os.environ.get("MOVE_MODE", "move"),
+        "move_mode": os.environ.get("MOVE_MODE", "copy"),
+        "qbit_category": os.environ.get("QBIT_CATEGORY", "Stash"),
         "db_path": os.environ.get("DB_PATH", "/data/seen.db"),
         "log_level": os.environ.get("LOG_LEVEL", "INFO"),
     }
@@ -98,7 +99,7 @@ def daemon(cfg):
 
     while running:
         try:
-            torrents = qbit.get_completed_torrents()
+            torrents = qbit.get_completed_torrents(cfg["qbit_category"])
         except Exception:
             log.exception("Failed to fetch torrents")
             _sleep(poll_interval, lambda: running)