feat: add SvelteKit adapter

Add framework adapter for SvelteKit with:
- `getApp()` - get bknd app instance
- `serve()` - request handler for hooks.server.ts

Usage in hooks.server.ts:
```typescript
import { serve } from "bknd/adapter/sveltekit";
import config from "../bknd.config";

const bkndHandler = serve(config);

export const handle = async ({ event, resolve }) => {
  if (event.url.pathname.startsWith("/api/")) {
    return bkndHandler(event);
  }
  return resolve(event);
};
```

Includes:
- Adapter implementation (app/src/adapter/sveltekit/)
- Test suite
- Working example (examples/sveltekit/)
- Package exports and types

examples/sveltekit/README.md

@@ -0,0 +1,26 @@
+# bknd + SvelteKit Example
+
+This example shows how to integrate bknd with SvelteKit.
+
+## Setup
+
+```bash
+bun install
+bun run dev
+```
+
+## How it works
+
+1. **`bknd.config.ts`** - bknd configuration with database connection, schema, and seed data
+2. **`src/hooks.server.ts`** - Routes `/api/*` requests to bknd
+3. **`src/routes/+page.server.ts`** - Uses `getApp()` to fetch data server-side
+
+## API Endpoints
+
+- `GET /api/data/entity/todos` - List todos (requires auth)
+- `POST /api/auth/password/login` - Login
+
+## Test Credentials
+
+- Email: `admin@example.com`
+- Password: `password`