Add admin features, responsive UI, user reviews, visit stats, and channel-colored markers

- Admin: video management with Google Maps match status, manual restaurant mapping, restaurant remap on name change
- Admin: user management tab with favorites/reviews detail
- Admin: channel deletion fix for IDs with slashes
- Frontend: responsive mobile layout (map top, list bottom, 2-row header)
- Frontend: channel-colored map markers with legend
- Frontend: my reviews list, favorites toggle, visit counter overlay
- Frontend: force light mode for dark theme devices
- Backend: visit tracking (site_visits table), user reviews endpoint
- Backend: bulk transcript/extract streaming, geocode key fixes
- Nginx config for production deployment

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

backend/api/routes/reviews.py

@@ -95,3 +95,74 @@ def list_my_reviews(
 ):
     """List current user's reviews."""
     return review.get_user_reviews(current_user["sub"], limit=limit, offset=offset)
+
+
+# --- Favorites ---
+
+@router.get("/restaurants/{restaurant_id}/favorite")
+def get_favorite_status(
+    restaurant_id: str,
+    current_user: dict = Depends(get_current_user),
+):
+    """Check if current user has favorited this restaurant."""
+    from core.db import conn
+    with conn() as c:
+        cur = c.cursor()
+        cur.execute(
+            "SELECT id FROM user_favorites WHERE user_id = :u AND restaurant_id = :r",
+            {"u": current_user["sub"], "r": restaurant_id},
+        )
+        return {"favorited": cur.fetchone() is not None}
+
+
+@router.post("/restaurants/{restaurant_id}/favorite")
+def toggle_favorite(
+    restaurant_id: str,
+    current_user: dict = Depends(get_current_user),
+):
+    """Toggle favorite. Returns new state."""
+    from core.db import conn
+    user_id = current_user["sub"]
+    with conn() as c:
+        cur = c.cursor()
+        cur.execute(
+            "SELECT id FROM user_favorites WHERE user_id = :u AND restaurant_id = :r",
+            {"u": user_id, "r": restaurant_id},
+        )
+        row = cur.fetchone()
+        if row:
+            cur.execute("DELETE FROM user_favorites WHERE id = :fid", {"fid": row[0]})
+            return {"favorited": False}
+        else:
+            cur.execute(
+                "INSERT INTO user_favorites (user_id, restaurant_id) VALUES (:u, :r)",
+                {"u": user_id, "r": restaurant_id},
+            )
+            return {"favorited": True}
+
+
+@router.get("/users/me/favorites")
+def list_my_favorites(
+    current_user: dict = Depends(get_current_user),
+):
+    """List current user's favorite restaurants."""
+    from core.db import conn
+    sql = """
+        SELECT r.id, r.name, r.address, r.region, r.latitude, r.longitude,
+               r.cuisine_type, r.price_range, r.google_place_id,
+               r.business_status, r.rating, r.rating_count,
+               f.created_at
+        FROM user_favorites f
+        JOIN restaurants r ON r.id = f.restaurant_id
+        WHERE f.user_id = :u
+        ORDER BY f.created_at DESC
+    """
+    with conn() as c:
+        cur = c.cursor()
+        cur.execute(sql, {"u": current_user["sub"]})
+        cols = [d[0].lower() for d in cur.description]
+        rows = [dict(zip(cols, row)) for row in cur.fetchall()]
+        for r in rows:
+            if r.get("created_at"):
+                r["created_at"] = r["created_at"].isoformat()
+        return rows