refactor modes implementation and improve validation handling

refactor `code` and `hybrid` modes for better type safety and configuration flexibility. add `_isProd` helper to standardize environment checks and improve plugin syncing warnings. adjust validation logic for clean JSON schema handling and enhance test coverage for modes.

app/src/adapter/bun/bun.adapter.ts

@@ -43,6 +43,7 @@ export function createHandler<Env = BunEnv>(
 
 export function serve<Env = BunEnv>(
    {
+      app,
       distPath,
       connection,
       config: _config,
@@ -62,6 +63,7 @@ export function serve<Env = BunEnv>(
       port,
       fetch: createHandler(
          {
+            app,
             connection,
             config: _config,
             options,