feat(model-adapter): add remote model selection

- Fetch and normalize OpenAI and Anthropic model lists through the proxy service.
- Add searchable multi-model selection with localized UI and persisted adapter mappings.
- Cover endpoint resolution, authentication, pagination, and response parsing.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/bridge/proxy.go

@@ -24,6 +24,12 @@ type ModelAdapterTestResult = client.ModelAdapterTestResult
 // ModelAdapterTestResultsPayload 定义测速结果事件载荷。
 type ModelAdapterTestResultsPayload = client.ModelAdapterTestResultsPayload
 
+// ModelAdapterModelsRequest 定义模型列表查询请求。
+type ModelAdapterModelsRequest = client.ModelAdapterModelsRequest
+
+// ModelAdapterModelsResult 定义模型列表查询结果。
+type ModelAdapterModelsResult = client.ModelAdapterModelsResult
+
 // CursorAccountStatus 是可安全展示给桌面前端的独立 Cursor 账号状态。
 type CursorAccountStatus = client.CursorAccountStatus
 
@@ -119,6 +125,11 @@ func (s *ProxyService) GetModelAdapterTestResults() []ModelAdapterTestResult {
 	return s.core.GetModelAdapterTestResults()
 }
 
+// FetchModelAdapterModels 用于从模型服务读取可用模型列表。
+func (s *ProxyService) FetchModelAdapterModels(input ModelAdapterModelsRequest) (ModelAdapterModelsResult, error) {
+	return s.core.FetchModelAdapterModels(input)
+}
+
 // GetDeviceID 用于处理与 GetDeviceID 相关的逻辑。
 func (s *ProxyService) GetDeviceID() (string, error) {
 	return s.core.GetDeviceID()