Improve logging and simplify fzf implementation

- Refactor fzf search to use Bun's $ syntax for cleaner command execution
- Add request/response duration logging to server middleware
- Set default service name for logging to improve log clarity

🤖 Generated with [OpenCode](https://opencode.ai)

Co-Authored-By: OpenCode <noreply@opencode.ai>

packages/opencode/src/server/server.ts

@@ -56,12 +56,16 @@ export namespace Server {
           },
         )
       })
-      .use((c, next) => {
+      .use(async (c, next) => {
         log.info("request", {
           method: c.req.method,
           path: c.req.path,
         })
-        return next()
+        const start = Date.now()
+        await next()
+        log.info("response", {
+          duration: Date.now() - start,
+        })
       })
       .get(
         "/openapi",