Fix TypeScript errors and clean up unused imports

- Remove unused fs import from app.ts
- Remove unused LLM import and missing module reference from server.ts
- Fix parameter naming inconsistency in fetch.ts execute function
- Add missing metadata property to fetch.ts return statement
- Update test file to use correct API signatures and parameter names
- Remove unused parameters from example.ts

🤖 Generated with opencode
Co-Authored-By: opencode <noreply@opencode.ai>

packages/opencode/src/server/server.ts

@@ -6,7 +6,6 @@ import { streamSSE } from "hono/streaming"
 import { Session } from "../session/session"
 import { resolver, validator as zValidator } from "hono-openapi/zod"
 import { z } from "zod"
-import { LLM } from "../llm/llm"
 import { Message } from "../session/message"
 import { Provider } from "../provider/provider"