feat: ComfyUI video assistant SaaS plan + shared types cleanup

- Add plan/2026-05-18-comfyui-video-assistant-saas.md (gpt-5.5 generated)
- Add src/server/ and src/shared/ type definitions
- Update comfyui routes and api_key auth
- Remove old metapi docs, deploy/k3s, and deprecated configs

src/routes/comfyui/mod.rs

@@ -83,6 +83,8 @@ pub fn routes() -> Router<AppState> {
         .route("/api/comfyui/queue", get(proxy_get_queue))
         .route("/api/comfyui/view", get(proxy_get_view))
         // Static proxy (public — assets/JS/CSS)
+        .route("/api/comfyui/proxy", get(proxy_static_root))
+        .route("/api/comfyui/proxy/", get(proxy_static_root))
         .route("/api/comfyui/proxy/{*path}", get(proxy_static))
         // HTML page (public)
         .route("/comfyui", get(comfyui_page))
@@ -146,6 +148,11 @@ async fn proxy_get_view(
 
 // ── Static proxy (public — assets/JS/CSS for iframe) ─────────────────
 
+/// GET /api/comfyui/proxy (root) — redirect to proxied root
+async fn proxy_static_root() -> AppResult<Response> {
+    proxy_static(Path("/".to_string())).await
+}
+
 /// GET /api/comfyui/proxy/{path} — proxy everything (HTML, assets)
 async fn proxy_static(Path(path): Path<String>) -> AppResult<Response> {
     info!("GET /api/comfyui/proxy/{}", path);