feat: 添加 opencode 模块和相关服务

shared/modules/opencode/index.ts

@@ -0,0 +1,12 @@
+import { defineModule } from '../types.js'
+
+export const OPENCODE_MODULE = defineModule({
+  id: 'opencode',
+  name: 'OpenCode',
+  basePath: '/opencode',
+  order: 15,
+  version: '1.0.0',
+  backend: {
+    enabled: false,
+  },
+})