Improve asset scanner logging

- Add log when scanner start is requested and when skipped due to already running
- Remove noisy 'no mime_type' info log (expected during fast stub phase)

Amp-Thread-ID: https://ampcode.com/threads/T-019c4f56-3fe1-72cb-888a-3ac4ac99b3d7
Co-authored-by: Amp <amp@ampcode.com>

app/assets/seeder.py

@@ -118,8 +118,10 @@ class AssetSeeder:
         Returns:
             True if scan was started, False if already running
         """
+        logging.info("Asset seeder start requested (roots=%s, phase=%s)", roots, phase.value)
         with self._lock:
             if self._state != State.IDLE:
+                logging.info("Asset seeder already running, skipping start")
                 return False
             self._state = State.RUNNING
             self._progress = Progress()

app/assets/services/bulk_ingest.py

@@ -165,8 +165,6 @@ def batch_insert_seed_assets(
         path_to_asset_id[absolute_path] = asset_id
 
         mime_type = spec.get("mime_type")
-        if mime_type is None:
-            logging.info("batch_insert_seed_assets: no mime_type for %s", absolute_path)
         asset_rows.append(
             {
                 "id": asset_id,