feat(server): 添加统一命令系统 API

- 新增 /api/commands 路由，支持列出、查询、执行和搜索命令
- Server 通过动态导入 Core 的 CommandRegistry 和 CommandExecutor
- CLI、Web、Desktop 客户端均可通过 REST API 访问斜杠命令
- 支持三层命令优先级: project > user > builtin

packages/ui/src/api/client.ts

@@ -10,6 +10,10 @@ import type {
   FileReadResponse,
   FileTreeResponse,
   ServerConfig,
+  CommandInfo,
+  CommandSearchResult,
+  CommandExecuteResult,
+  CommandListResponse,
 } from './types.js';
 
 // Re-export types
@@ -23,6 +27,10 @@ export type {
   FileTreeNode,
   FileTreeResponse,
   ServerConfig,
+  CommandInfo,
+  CommandSearchResult,
+  CommandExecuteResult,
+  CommandListResponse,
 } from './types.js';
 
 // API Configuration
@@ -163,3 +171,35 @@ export async function updateConfig(
 ): Promise<{ success: boolean; data: ServerConfig }> {
   return request('PATCH', '/config', config);
 }
+
+// Commands
+export async function listCommands(): Promise<{ success: boolean; data: CommandListResponse }> {
+  return request('GET', '/commands');
+}
+
+export async function getCommand(name: string): Promise<{ success: boolean; data: CommandInfo }> {
+  return request('GET', `/commands/${encodeURIComponent(name)}`);
+}
+
+export async function executeCommand(
+  name: string,
+  args: string = ''
+): Promise<{ success: boolean; data?: CommandExecuteResult; error?: string }> {
+  return request('POST', `/commands/${encodeURIComponent(name)}/execute`, {
+    arguments: args,
+  });
+}
+
+export async function searchCommands(
+  query: string,
+  limit: number = 10
+): Promise<{ success: boolean; data: CommandSearchResult[] }> {
+  return request('POST', '/commands/search', { query, limit });
+}
+
+export async function reloadCommands(): Promise<{
+  success: boolean;
+  data: { message: string; stats: { total: number; bySource: Record<string, number> } };
+}> {
+  return request('POST', '/commands/reload');
+}