Add view count to videos

- Video model: view_count column (Integer, nullable)
- ytdlp._normalize_video: extract view_count from yt-dlp info
- _VIDEO_SELECT: include v.view_count in all queries
- VideoDetail schema: view_count field
- Watch page: formatViews() helper, show "X.XM views" in meta row
  alongside date and category

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

backend/models.py

@@ -60,6 +60,7 @@ class Video(Base):
     tags = Column(Text)      # JSON array string
     category = Column(String)
     chapters = Column(Text)  # JSON array of {start_time, end_time, title}
+    view_count = Column(Integer)
 
 
 class UserVideo(Base):

backend/routers/videos.py

@@ -65,6 +65,7 @@ class VideoDetail(BaseModel):
     download_resolution: Optional[str] = None
     local_file_url: Optional[str] = None
     is_recommended: bool = False
+    view_count: Optional[int] = None
 
     model_config = {"from_attributes": True}
 
@@ -421,7 +422,7 @@ def surprise_me(
 
 _VIDEO_SELECT = """
     SELECT v.id, v.youtube_video_id, v.title, v.description, v.thumbnail_url,
-           v.duration_seconds, v.published_at, v.tags, v.category,
+           v.duration_seconds, v.published_at, v.tags, v.category, v.view_count,
            c.id AS channel_id, c.name AS channel_name, c.youtube_channel_id AS channel_youtube_id,
            COALESCE(uv.watched, 0) AS watched,
            COALESCE(uv.watch_progress_seconds, 0) AS watch_progress_seconds,

backend/services/ytdlp.py

@@ -74,6 +74,7 @@ def _normalize_video(info: dict) -> dict:
         "tags": json.dumps(info.get("tags") or []),
         "category": info.get("category") or (info.get("categories") or [None])[0],
         "chapters": json.dumps(chapters) if chapters else None,
+        "view_count": info.get("view_count"),
         "channel": {
             "youtube_channel_id": info.get("channel_id"),
             "name": info.get("channel") or info.get("uploader", ""),