fix(fam-edge): WatchProcessor 递归扫描子目录（GDrive 录像按 YYYYMMDDAM/PM 子目录组织）

fam-edge/src/fam_edge/watch_processor.py

@@ -35,19 +35,21 @@ class WatchProcessor:
         self._thread = None
 
     def _scan_files(self) -> List[str]:
+        """递归扫描监听目录，返回所有视频文件的完整路径"""
         if not os.path.isdir(self.local_dir):
             logger.warning(f"监听目录不存在: {self.local_dir}")
             return []
         out = []
-        for fn in sorted(os.listdir(self.local_dir)):
-            if fn.lower().endswith(VIDEO_EXTS):
-                out.append(fn)
+        for root, _dirs, files in os.walk(self.local_dir):
+            for fn in sorted(files):
+                if fn.lower().endswith(VIDEO_EXTS):
+                    out.append(os.path.join(root, fn))
         return out
 
     def _register_new(self, files: List[str]):
-        for fn in files:
+        for path in files:
+            fn = os.path.basename(path)
             if self.db.get_video_by_filename(fn) is None:
-                path = os.path.join(self.local_dir, fn)
                 self.db.ensure_video(fn, path, camera_name=self.camera_name)
                 logger.info(f"登记新视频: {fn}")