feat: add bun-fullstack agent and update skills

.agent/skills/tech-stack/elysiajs/integrations/deno.md

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+# Deno Integration
+Run Elysia on Deno
+
+## What It Is
+Run Elysia on Deno via Web Standard Request/Response.
+
+## Setup
+Wrap `Elysia.fetch` in `Deno.serve`:
+```typescript
+import { Elysia } from 'elysia'
+
+const app = new Elysia()
+  .get('/', () => 'Hello Elysia')
+  .listen(3000)
+
+Deno.serve(app.fetch)
+```
+
+Run:
+```bash
+deno serve --watch src/index.ts
+```
+
+## Port Config
+```typescript
+Deno.serve(app.fetch)                  // Default
+Deno.serve({ port: 8787 }, app.fetch)  // Custom port
+```
+
+## pnpm
+[Inference] pnpm doesn't auto-install peer deps. Manual install required:
+```bash
+pnpm add @sinclair/typebox openapi-types
+```