feat: add admin video jobs management endpoints and UI for listing, cancelling, and purging video jobs

Co-authored-by: Copilot <copilot@github.com>

frontend/app/main.py

@@ -217,10 +217,11 @@ def dashboard():
     images = img_resp.json() if img_resp.status_code == 200 else []
     gen_resp = _api("GET", "/generate/images", token=token)
     generated_images = gen_resp.json() if gen_resp.status_code == 200 else []
-    
+
     vid_resp = _api("GET", "/generate/videos", token=token)
     videos = vid_resp.json() if vid_resp.status_code == 200 else []
-    pending_videos = [v for v in videos if v.get("status") not in ("completed", "failed")]
+    pending_videos = [v for v in videos if v.get(
+        "status") not in ("completed", "failed")]
     completed_videos = [v for v in videos if v.get("status") == "completed"]
 
     return render_template("dashboard.html", user=user, images=images,
@@ -418,7 +419,7 @@ def generate_video():
         duration = int(
             duration_raw) if duration_raw.strip().isdigit() else None
         resolution = request.form.get("resolution", "").strip() or None
-        
+
         if mode == "image":
             resp = _api("POST", "/generate/video/from-image", token=token, json={
                 "model": request.form.get("model", "").strip(),
@@ -436,7 +437,7 @@ def generate_video():
                 "duration_seconds": duration,
                 "resolution": resolution,
             })
-            
+
         if resp.status_code == 200:
             result = resp.json()
             # On success, redirect to the detail page to monitor progress
@@ -506,6 +507,13 @@ def admin_models():
     return render_template("admin/models.html")
 
 
+@app.get("/admin/videos")
+@admin_required
+def admin_videos():
+    """Show all video generation jobs across all users."""
+    return render_template("admin/videos.html")
+
+
 # ── Profile ───────────────────────────────────────────────────────────────
 
 @app.route("/users/profile", methods=["GET", "POST"])