refactor: 简化模型管理，移除启用/禁用，优化测试和布局

- 移除供应商/模型启用禁用能力，清理DB schema/migration/API/前端
- 供应商测试改为Base URL连通性+/models探测
- 新增POST /api/models/test模型连接测试
- 新增GET /api/providers/options专用供应商选项接口
- 统一工具栏为ModelsToolbar，参考项目管理布局
- 模型弹窗优化：默认能力、响应式3列标签、并排数值
- 前后端正整数校验、供应商下拉loading/error/empty状态
- 表格列宽统一，操作列/名称列固定宽度

src/shared/api.ts

@@ -40,7 +40,6 @@ export interface Model {
   capabilities: ModelCapability[];
   contextLength: null | number;
   createdAt: string;
-  enabled: boolean;
   id: string;
   maxOutputTokens: null | number;
   modelId: string;
@@ -81,6 +80,15 @@ export interface ModelResponse {
   model: Model;
 }
 
+export interface ModelTestResponse {
+  message: string;
+  ok: boolean;
+}
+
+export interface ModelTestResultResponse {
+  modelTestResponse: ModelTestResponse;
+}
+
 export interface Project {
   archivedAt: null | string;
   createdAt: string;
@@ -108,7 +116,6 @@ export interface Provider {
   apiKey: string;
   baseUrl: string;
   createdAt: string;
-  enabled: boolean;
   id: string;
   name: string;
   type: ProviderType;
@@ -122,6 +129,16 @@ export interface ProviderListResponse {
   total: number;
 }
 
+export interface ProviderOption {
+  id: string;
+  name: string;
+  type: ProviderType;
+}
+
+export interface ProviderOptionsResponse {
+  items: ProviderOption[];
+}
+
 export interface ProviderResponse {
   provider: Provider;
 }
@@ -139,6 +156,11 @@ export type ProviderType = "anthropic" | "openai" | "openai-compatible";
 
 export type RuntimeMode = "development" | "production" | "test";
 
+export interface TestModelRequest {
+  modelId: string;
+  providerId: string;
+}
+
 export interface UpdateModelRequest {
   capabilities?: ModelCapability[];
   contextLength?: null | number;