refactor(server): split opencode config/auth/ui-auth into domain modules (#454)

* docs(agents): map opencode module documentation

* docs(opencode): document split module responsibilities

* refactor(opencode): centralize shared config and file helpers

* refactor(opencode): move auth storage helpers into domain module

* refactor(opencode): move UI auth implementation into domain module

* refactor(opencode): isolate agent scope and CRUD logic

* refactor(opencode): isolate command scope and CRUD logic

* refactor(opencode): isolate provider config helpers

* refactor(opencode): isolate skill discovery and CRUD logic

* refactor(opencode): define single public module entrypoint

* refactor(opencode): remove legacy opencode-config module

* refactor(opencode): remove obsolete opencode-config typings

* refactor(opencode): remove legacy opencode-auth module

* refactor(opencode): remove legacy ui-auth shim

* refactor(server): import opencode APIs from new module paths

* refactor(tts): consume auth helpers from opencode domain module

* refactor(quota): point claude provider auth import to opencode domain

* refactor(quota): point codex provider auth import to opencode domain

* refactor(quota): point copilot provider auth import to opencode domain

* refactor(quota): point google auth import to opencode domain

* refactor(quota): point kimi provider auth import to opencode domain

* refactor(quota): point nanogpt provider auth import to opencode domain

* refactor(quota): point openai provider auth import to opencode domain

* refactor(quota): point openrouter provider auth import to opencode domain

* refactor(quota): point zai provider auth import to opencode domain

* fix(opencode): restore provider source and disconnect semantics

packages/web/server/lib/tts-service.js

@@ -6,7 +6,7 @@
  */
 
 import OpenAI from 'openai';
-import { readAuthFile } from './opencode-auth.js';
+import { readAuthFile } from './opencode/auth.js';
 
 // Voice options from OpenAI
 export const TTS_VOICES = [