feat(saas): Phase 2 — 模型配置模块

- Provider CRUD (列表/详情/创建/更新/删除)
- Model CRUD (列表/详情/创建/更新/删除)
- Account API Key 管理 (创建/轮换/撤销/掩码显示)
- Usage 统计 (总量/按模型/按天, 支持时间/供应商/模型过滤)
- 权限控制 (provider:manage, model:manage)
- 3 个新集成测试覆盖 providers/models/keys

crates/zclaw-saas/src/model_config/mod.rs

@@ -1 +1,26 @@
 //! 模型配置模块
+
+pub mod types;
+pub mod service;
+pub mod handlers;
+
+use axum::routing::{delete, get, post};
+use crate::state::AppState;
+
+/// 模型配置路由 (需要认证)
+pub fn routes() -> axum::Router<AppState> {
+    axum::Router::new()
+        // Providers
+        .route("/api/v1/providers", get(handlers::list_providers).post(handlers::create_provider))
+        .route("/api/v1/providers/{id}", get(handlers::get_provider).put(handlers::update_provider).delete(handlers::delete_provider))
+        .route("/api/v1/providers/{id}/models", get(handlers::list_provider_models))
+        // Models
+        .route("/api/v1/models", get(handlers::list_models).post(handlers::create_model))
+        .route("/api/v1/models/{id}", get(handlers::get_model).put(handlers::update_model).delete(handlers::delete_model))
+        // Account API Keys
+        .route("/api/v1/keys", get(handlers::list_api_keys).post(handlers::create_api_key))
+        .route("/api/v1/keys/{id}", delete(handlers::revoke_api_key))
+        .route("/api/v1/keys/{id}/rotate", post(handlers::rotate_api_key))
+        // Usage
+        .route("/api/v1/usage", get(handlers::get_usage))
+}