Fix SQLite threading bug, correct FTP upload path

- Add check_same_thread=False to SQLite connection (watchdog
  callbacks run in a separate thread)
- Camera upload dir is /data/photos/incoming (not /incoming)

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

processor.py

@@ -50,7 +50,7 @@ log = logging.getLogger("processor")
 def init_db():
     """Initialize the SQLite tracking database."""
     DB_PATH.parent.mkdir(parents=True, exist_ok=True)
-    conn = sqlite3.connect(str(DB_PATH))
+    conn = sqlite3.connect(str(DB_PATH), check_same_thread=False)
     conn.execute(
         """CREATE TABLE IF NOT EXISTS processed_files (
             filename TEXT PRIMARY KEY,