refactor: fully embed ComfyUI into BoosAPI, drop external dependency

- Remove comfyui.ts (external proxy to ComfyUI at :8188)
- Remove videoAgent.ts (redundant with comfyuiAgent)
- Remove ComfyUI Python process from Dockerfile (CPU-only, useless)
- Update boosapi_comfy_nodes.py default to localhost BoosAPI
- Clean up index.ts, App.tsx, desktop.ts registrations
- Sidebar: merge '视频工作台'/'视频助手' into single '视频助手' entry

Signed-off-by: boos <boos@boos.lat>

src/web/pages/ComfyUI.tsx

@@ -1,15 +1,8 @@
 import React from 'react';
 
 export default function ComfyUI() {
-  const [isDark, setIsDark] = React.useState(true);
-
   React.useEffect(() => {
-    const el = document.documentElement;
-    const check = () => setIsDark(el.getAttribute('data-theme') !== 'light');
-    check();
-    const mo = new MutationObserver(check);
-    mo.observe(el, { attributes: true, attributeFilter: ['data-theme'] });
-    return () => mo.disconnect();
+    window.location.href = '/comfyui-agent';
   }, []);
 
   return (
@@ -18,20 +11,14 @@ export default function ComfyUI() {
         width: '100%',
         height: 'calc(100vh - 56px)',
         display: 'flex',
-        flexDirection: 'column',
-        background: isDark ? '#1a1a2e' : '#f5f5f5',
+        alignItems: 'center',
+        justifyContent: 'center',
+        background: 'var(--color-bg, #0f0f1a)',
+        color: 'var(--color-text-secondary, #888)',
+        fontSize: '16px',
       }}
     >
-      <iframe
-        src="/comfyui"
-        style={{
-          width: '100%',
-          height: '100%',
-          border: 'none',
-        }}
-        title="ComfyUI"
-        allow="clipboard-read; clipboard-write"
-      />
+      🔄 正在跳转至 AI 视频助手...
     </div>
   );
 }