Add docker support

utils.py

@@ -69,3 +69,17 @@ def get_error_message(status_code: int) -> str:
         503: "Service Unavailable",
     }
     return errors.get(status_code, "Unknown error")
+import hashlib
+
+# simple in-memory mapping: video_id -> original URL
+_video_map = {}
+
+
+def get_video_id(url: str) -> str:
+    vid = hashlib.md5(url.encode()).hexdigest()
+    _video_map[vid] = url
+    return vid
+
+
+def resolve_video_id(vid: str) -> str | None:
+    return _video_map.get(vid)