test(saas): Phase 1 integration tests — billing + scheduled_task + knowledge (68 tests)

- Fix TIMESTAMPTZ decode errors: add ::TEXT cast to all SELECT queries
  where Row structs use String for TIMESTAMPTZ columns (~22 locations)
- Fix Axum 0.7 route params: {id} → :id in billing/knowledge/scheduled_task routes
- Fix JSONB bind: scheduled_task INSERT uses ::jsonb cast for input_payload
- Add billing_test.rs (14 tests): plans, subscription, usage, payments, invoices
- Add scheduled_task_test.rs (12 tests): CRUD, validation, isolation
- Add knowledge_test.rs (20 tests): categories, items, versions, search, analytics, permissions
- Fix auth test regression: 6 tests were failing due to TIMESTAMPTZ type mismatch

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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

@@ -8,23 +8,41 @@ pub mod invoice_pdf;
 
 use axum::routing::{get, post};
 
-/// 需要认证的计费路由
+/// 全部计费路由（用于 main.rs 一次性挂载）
 pub fn routes() -> axum::Router<crate::state::AppState> {
     axum::Router::new()
         .route("/api/v1/billing/plans", get(handlers::list_plans))
-        .route("/api/v1/billing/plans/{id}", get(handlers::get_plan))
+        .route("/api/v1/billing/plans/:id", get(handlers::get_plan))
         .route("/api/v1/billing/subscription", get(handlers::get_subscription))
         .route("/api/v1/billing/usage", get(handlers::get_usage))
         .route("/api/v1/billing/usage/increment", post(handlers::increment_usage_dimension))
         .route("/api/v1/billing/payments", post(handlers::create_payment))
-        .route("/api/v1/billing/payments/{id}", get(handlers::get_payment_status))
-        .route("/api/v1/billing/invoices/{id}/pdf", get(handlers::get_invoice_pdf))
+        .route("/api/v1/billing/payments/:id", get(handlers::get_payment_status))
+        .route("/api/v1/billing/invoices/:id/pdf", get(handlers::get_invoice_pdf))
+}
+
+/// 计划查询路由（无需 AuthContext，可挂载到公开区域）
+pub fn plan_routes() -> axum::Router<crate::state::AppState> {
+    axum::Router::new()
+        .route("/api/v1/billing/plans", get(handlers::list_plans))
+        .route("/api/v1/billing/plans/:id", get(handlers::get_plan))
+}
+
+/// 需要认证的计费路由（订阅、用量、支付、发票）
+pub fn protected_routes() -> axum::Router<crate::state::AppState> {
+    axum::Router::new()
+        .route("/api/v1/billing/subscription", get(handlers::get_subscription))
+        .route("/api/v1/billing/usage", get(handlers::get_usage))
+        .route("/api/v1/billing/usage/increment", post(handlers::increment_usage_dimension))
+        .route("/api/v1/billing/payments", post(handlers::create_payment))
+        .route("/api/v1/billing/payments/:id", get(handlers::get_payment_status))
+        .route("/api/v1/billing/invoices/:id/pdf", get(handlers::get_invoice_pdf))
 }
 
 /// 支付回调路由（无需 auth — 支付宝/微信服务器回调）
 pub fn callback_routes() -> axum::Router<crate::state::AppState> {
     axum::Router::new()
-        .route("/api/v1/billing/callback/{method}", post(handlers::payment_callback))
+        .route("/api/v1/billing/callback/:method", post(handlers::payment_callback))
 }
 
 /// mock 支付页面路由（开发模式）