feat(ai): replace hardcoded design kits with dynamic open-design templates and registries

vibn-frontend/app/api/mcp/route.ts

@@ -18,6 +18,8 @@
  */
 
 import { NextResponse } from "next/server";
+import fs from "fs";
+import path from "path";
 import { BigQuery } from "@google-cloud/bigquery";
 import { toolBrowserConsole, toolBrowserNavigate } from "./browser";
 import { requireWorkspacePrincipal } from "@/lib/auth/workspace-auth";
@@ -424,6 +426,8 @@ export async function POST(request: Request) {
         return await toolFsWrite(principal, params);
       case "fs.edit":
         return await toolFsEdit(principal, params);
+      case "get_design_template":
+        return await toolGetDesignTemplate(params);
       case "apps.templates.scaffold":
         return await toolAppsTemplatesScaffold(principal, params);
       case "generate_media":
@@ -4614,6 +4618,48 @@ async function toolFsRead(principal: Principal, params: Record<string, any>) {
   });
 }
 
+async function toolGetDesignTemplate(params: Record<string, unknown>) {
+  const templateId = String(params.template_id || "").trim();
+  if (!templateId) {
+    return NextResponse.json(
+      { error: "Missing required parameter 'template_id'" },
+      { status: 400 },
+    );
+  }
+
+  // Prevent directory traversal
+  if (templateId.includes("..") || templateId.includes("/")) {
+    return NextResponse.json({ error: "Invalid template_id" }, { status: 400 });
+  }
+
+  const skillPath = path.join(
+    process.cwd(),
+    "lib",
+    "scaffold",
+    "open-design",
+    "design-templates",
+    templateId,
+    "SKILL.md",
+  );
+
+  try {
+    if (!fs.existsSync(skillPath)) {
+      return NextResponse.json(
+        { error: `Template '${templateId}' not found or missing SKILL.md` },
+        { status: 404 },
+      );
+    }
+
+    const content = await fs.promises.readFile(skillPath, "utf-8");
+    return NextResponse.json({ result: { content } });
+  } catch (err: any) {
+    return NextResponse.json(
+      { error: `Failed to read template: ${err.message}` },
+      { status: 500 },
+    );
+  }
+}
+
 async function toolAppsTemplatesScaffold(
   principal: Principal,
   params: Record<string, any>,