feat: add bun-fullstack agent and update skills

.agent/skills/tech-stack/elysiajs/integrations/tanstack-start.md

@@ -0,0 +1,87 @@
+# Tanstack Start Integration
+
+## What It Is
+Elysia runs inside Tanstack Start server routes.
+
+## Setup
+1. Create `src/routes/api.$.ts`
+2. Define Elysia server
+3. Export handlers in `server.handlers`:
+```typescript
+// src/routes/api.$.ts
+import { Elysia } from 'elysia'
+import { createFileRoute } from '@tanstack/react-router'
+import { createIsomorphicFn } from '@tanstack/react-start'
+
+const app = new Elysia({
+  prefix: '/api'
+}).get('/', 'Hello Elysia!')
+
+const handle = ({ request }: { request: Request }) => app.fetch(request)
+
+export const Route = createFileRoute('/api/$')({
+  server: {
+    handlers: {
+      GET: handle,
+      POST: handle
+    }
+  }
+})
+```
+
+Runs on `/api`. Add methods to `server.handlers` as needed.
+
+## Eden (End-to-End Type Safety)
+Isomorphic pattern with `createIsomorphicFn`:
+```typescript
+// src/routes/api.$.ts
+export const getTreaty = createIsomorphicFn()
+  .server(() => treaty(app).api)
+  .client(() => treaty<typeof app>('localhost:3000').api)
+```
+
+- Server: Direct call (no HTTP overhead)
+- Client: HTTP call
+
+## Loader Data
+Fetch before render:
+```tsx
+// src/routes/index.tsx
+import { createFileRoute } from '@tanstack/react-router'
+import { getTreaty } from './api.$'
+
+export const Route = createFileRoute('/a')({
+  component: App,
+  loader: () => getTreaty().get().then((res) => res.data)
+})
+
+function App() {
+  const data = Route.useLoaderData()
+  return data
+}
+```
+
+Executed server-side during SSR. No HTTP overhead. Type-safe.
+
+## React Query
+```tsx
+import { useQuery } from '@tanstack/react-query'
+import { getTreaty } from './api.$'
+
+function App() {
+  const { data: response } = useQuery({
+    queryKey: ['get'],
+    queryFn: () => getTreaty().get()
+  })
+  
+  return response?.data
+}
+```
+
+Works with all React Query features.
+
+## pnpm
+Manual install:
+```bash
+pnpm add @sinclair/typebox openapi-types
+```