Backend enhancements: auth, channels, restaurants, daemon improvements

- Add admin auth dependency and role checks
- Expand channel and restaurant API routes
- Improve YouTube transcript fetching
- Enhance daemon worker with better error handling and scheduling

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

backend/api/routes/auth.py

@@ -36,5 +36,22 @@ def login_google(body: GoogleLoginRequest):
 
 @router.get("/me")
 def get_me(current_user: dict = Depends(get_current_user)):
-    """Return current authenticated user info."""
-    return current_user
+    """Return current authenticated user info including admin status."""
+    from core.db import conn
+    user_id = current_user.get("sub") or current_user.get("id")
+    with conn() as c:
+        cur = c.cursor()
+        cur.execute(
+            "SELECT id, email, nickname, avatar_url, is_admin FROM tasteby_users WHERE id = :id",
+            {"id": user_id},
+        )
+        row = cur.fetchone()
+        if not row:
+            raise HTTPException(404, "User not found")
+        return {
+            "id": row[0],
+            "email": row[1],
+            "nickname": row[2],
+            "avatar_url": row[3],
+            "is_admin": bool(row[4]),
+        }