feat: initial brainstorming app — Nuxt 3 + SQLite + admin auth

Nuxt 3 app with:
- SQLite (better-sqlite3) for persistence
- Anonymous idea submission and voting
- Admin auth with session cookies
- AI analysis via Gemini API
- Nuxt UI components + Tailwind

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/api/ideas/[id].patch.ts

@@ -0,0 +1,20 @@
+import db from '../../utils/db'
+import { requireAdmin } from '../../utils/auth'
+
+export default defineEventHandler(async (event) => {
+  requireAdmin(event)
+  const id = getRouterParam(event, 'id')
+  const body = await readBody(event)
+
+  if (body.hidden !== undefined) {
+    db.prepare('UPDATE ideas SET hidden = ? WHERE id = ?').run(body.hidden ? 1 : 0, id)
+  }
+  if (body.text !== undefined) {
+    db.prepare('UPDATE ideas SET text = ? WHERE id = ?').run(body.text, id)
+  }
+  if (body.category !== undefined) {
+    db.prepare('UPDATE ideas SET category = ? WHERE id = ?').run(body.category, id)
+  }
+
+  return { ok: true }
+})