refactor(core,server): 简化配置加载，移除 workdir 参数

Provider 和 Agent 配置统一从全局目录加载，无需传递 workdir：
- ProviderRegistry.init() 不再需要 workdir 参数
- AgentRegistry.init() 不再需要 workdir 参数
- 配置文件路径统一使用 ~/.ai-terminal-assistant/

packages/server/src/agent/adapter.ts

@@ -156,7 +156,7 @@ interface PermissionManager {
  * Provider Registry 接口
  */
 interface ProviderRegistryInterface {
-  init(workdir?: string): Promise<void>;
+  init(): Promise<void>;
   isInitialized(): boolean;
 }
 
@@ -164,7 +164,7 @@ interface ProviderRegistryInterface {
  * Agent Registry 接口
  */
 interface AgentRegistryInterface {
-  init(workdir: string): Promise<void>;
+  init(): Promise<void>;
   isInitialized(): boolean;
 }
 
@@ -221,22 +221,18 @@ export async function initCore(): Promise<boolean> {
       return false;
     }
 
-    // 获取服务器配置的工作目录
-    const config = getConfig();
-    const workdir = config.workdir;
-
     // 初始化 ProviderRegistry（加载用户配置）
     const providerRegistry = core.getProviderRegistry();
     if (!providerRegistry.isInitialized()) {
-      await providerRegistry.init(workdir);
-      console.log('[Agent] ProviderRegistry initialized with workdir:', workdir);
+      await providerRegistry.init();
+      console.log('[Agent] ProviderRegistry initialized');
     }
 
     // 初始化 AgentRegistry（加载用户自定义 Agent 配置）
     const agentRegistry = core.agentRegistry;
     if (!agentRegistry.isInitialized()) {
-      await agentRegistry.init(workdir);
-      console.log('[Agent] AgentRegistry initialized with workdir:', workdir);
+      await agentRegistry.init();
+      console.log('[Agent] AgentRegistry initialized');
     }
 
     coreModule = core;

packages/server/src/routes/agents.ts

@@ -74,7 +74,7 @@ interface AgentConfigFile {
 // Core Agent 模块类型
 interface AgentModule {
   agentRegistry: {
-    init: (workdir: string) => Promise<void>;
+    init: () => Promise<void>;
     get: (name: string) => AgentInfo | undefined;
     list: () => AgentInfo[];
   };
@@ -152,8 +152,7 @@ async function ensureRegistryInitialized(): Promise<boolean> {
   if (!module) return false;
 
   if (!initialized) {
-    const config = getConfig();
-    await module.agentRegistry.init(config.workdir);
+    await module.agentRegistry.init();
     initialized = true;
   }
 

packages/server/src/routes/providers.ts

@@ -247,7 +247,7 @@ providersRouter.post('/', async (c) => {
 
     const registry = core.getProviderRegistry();
     registry.registerCustom(body);
-    await registry.saveConfig(getConfig().workdir);
+    await registry.saveConfig();
 
     return c.json({
       success: true,
@@ -285,7 +285,7 @@ providersRouter.put('/:id', async (c) => {
     }
 
     registry.setConfig(id, { ...body, id });
-    await registry.saveConfig(getConfig().workdir);
+    await registry.saveConfig();
 
     return c.json({
       success: true,
@@ -321,7 +321,7 @@ providersRouter.delete('/:id', async (c) => {
       return c.json({ success: false, error: `Provider not found: ${id}` }, 404);
     }
 
-    await registry.saveConfig(getConfig().workdir);
+    await registry.saveConfig();
 
     return c.json({
       success: true,
@@ -365,7 +365,7 @@ providersRouter.post('/:id/models', async (c) => {
 
     const registry = core.getProviderRegistry();
     registry.addCustomModel(providerId, body);
-    await registry.saveConfig(getConfig().workdir);
+    await registry.saveConfig();
 
     return c.json({
       success: true,
@@ -408,7 +408,7 @@ providersRouter.delete('/:id/models/:modelId', async (c) => {
       );
     }
 
-    await registry.saveConfig(getConfig().workdir);
+    await registry.saveConfig();
 
     return c.json({
       success: true,