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/knowledge/mod.rs

@@ -11,22 +11,22 @@ pub fn routes() -> axum::Router<crate::state::AppState> {
         // 分类管理
         .route("/api/v1/knowledge/categories", get(handlers::list_categories))
         .route("/api/v1/knowledge/categories", post(handlers::create_category))
-        .route("/api/v1/knowledge/categories/{id}", put(handlers::update_category))
-        .route("/api/v1/knowledge/categories/{id}", delete(handlers::delete_category))
-        .route("/api/v1/knowledge/categories/{id}/items", get(handlers::list_category_items))
+        .route("/api/v1/knowledge/categories/:id", put(handlers::update_category))
+        .route("/api/v1/knowledge/categories/:id", delete(handlers::delete_category))
+        .route("/api/v1/knowledge/categories/:id/items", get(handlers::list_category_items))
         .route("/api/v1/knowledge/categories/reorder", patch(handlers::reorder_categories))
         // 知识条目 CRUD
         .route("/api/v1/knowledge/items", get(handlers::list_items))
         .route("/api/v1/knowledge/items", post(handlers::create_item))
         .route("/api/v1/knowledge/items/batch", post(handlers::batch_create_items))
         .route("/api/v1/knowledge/items/import", post(handlers::import_items))
-        .route("/api/v1/knowledge/items/{id}", get(handlers::get_item))
-        .route("/api/v1/knowledge/items/{id}", put(handlers::update_item))
-        .route("/api/v1/knowledge/items/{id}", delete(handlers::delete_item))
+        .route("/api/v1/knowledge/items/:id", get(handlers::get_item))
+        .route("/api/v1/knowledge/items/:id", put(handlers::update_item))
+        .route("/api/v1/knowledge/items/:id", delete(handlers::delete_item))
         // 版本控制
-        .route("/api/v1/knowledge/items/{id}/versions", get(handlers::list_versions))
-        .route("/api/v1/knowledge/items/{id}/versions/{v}", get(handlers::get_version))
-        .route("/api/v1/knowledge/items/{id}/rollback/{v}", post(handlers::rollback_version))
+        .route("/api/v1/knowledge/items/:id/versions", get(handlers::list_versions))
+        .route("/api/v1/knowledge/items/:id/versions/:v", get(handlers::get_version))
+        .route("/api/v1/knowledge/items/:id/rollback/:v", post(handlers::rollback_version))
         // 检索
         .route("/api/v1/knowledge/search", post(handlers::search))
         .route("/api/v1/knowledge/recommend", post(handlers::recommend))