chore: convert submodules to standard directories for true monorepo structure

vibn-frontend/app/api/integrations/github/repos/route.ts

@@ -0,0 +1,53 @@
+/**
+ * GET /api/integrations/github/repos
+ *
+ * Returns the connected user's GitHub repos for the import-flow picker.
+ * Server-side: never exposes the raw token, only the public repo
+ * metadata the picker needs (name, full_name, description, language,
+ * is-private, last-pushed, default branch, html_url).
+ *
+ * 200 → { connected: true, login, repos: [...] }
+ * 200 → { connected: false }   ← user hasn't linked GitHub yet
+ * 401 → unauthorized
+ */
+
+import { NextResponse } from "next/server";
+import { authSession } from "@/lib/auth/session-server";
+import { loadGithubIntegration, listUserRepos } from "@/lib/integrations/github";
+
+export async function GET() {
+  const session = await authSession();
+  if (!session?.user?.email) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  const link = await loadGithubIntegration(session.user.email);
+  if (!link) {
+    return NextResponse.json({ connected: false });
+  }
+
+  try {
+    const repos = await listUserRepos(link.token);
+    return NextResponse.json({
+      connected: true,
+      login: link.login,
+      repos: repos.map(r => ({
+        id: r.id,
+        name: r.name,
+        fullName: r.full_name,
+        description: r.description,
+        defaultBranch: r.default_branch,
+        htmlUrl: r.html_url,
+        private: r.private,
+        language: r.language,
+        pushedAt: r.pushed_at,
+        fork: r.fork,
+      })),
+    });
+  } catch (err) {
+    return NextResponse.json(
+      { error: err instanceof Error ? err.message : "Failed to list repos" },
+      { status: 502 },
+    );
+  }
+}