feat: add bun-fullstack agent and update skills

.opencode/skills/tech-stack/elysiajs/integrations/sveltekit.md

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+
+# SvelteKit Integration
+
+## What It Is
+Run Elysia on SvelteKit server routes.
+
+## Setup
+1. Create `src/routes/[...slugs]/+server.ts`
+2. Define Elysia server
+3. Export fallback handler:
+```typescript
+// src/routes/[...slugs]/+server.ts
+import { Elysia, t } from 'elysia'
+
+const app = new Elysia()
+  .get('/', 'hello SvelteKit')
+  .post('/', ({ body }) => body, {
+    body: t.Object({ name: t.String() })
+  })
+
+interface WithRequest {
+  request: Request
+}
+
+export const fallback = ({ request }: WithRequest) => app.handle(request)
+```
+
+Treat as normal SvelteKit server route.
+
+## Prefix for Non-Root
+If placed in `src/routes/api/[...slugs]/+server.ts`, set prefix:
+```typescript
+// src/routes/api/[...slugs]/+server.ts
+import { Elysia, t } from 'elysia'
+
+const app = new Elysia({ prefix: '/api' })
+  .get('/', () => 'hi')
+  .post('/', ({ body }) => body, {
+    body: t.Object({ name: t.String() })
+  })
+
+type RequestHandler = (v: { request: Request }) => Response | Promise<Response>
+
+export const fallback: RequestHandler = ({ request }) => app.handle(request)
+```
+
+Ensures routing works in any location.
+
+## pnpm
+Manual install:
+```bash
+pnpm add @sinclair/typebox openapi-types
+```