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/agent_template/service.rs

@@ -4,8 +4,16 @@ use sqlx::{PgPool, Row};
 use crate::error::{SaasError, SaasResult};
 use super::types::*;
 
-/// Shared SELECT column list.
+/// Shared SELECT column list (with ::TEXT cast for TIMESTAMPTZ decode).
 const SELECT_COLUMNS: &str = "\
+    id, name, description, category, source, model, system_prompt, \
+    tools, capabilities, temperature, max_tokens, visibility, status, \
+    current_version, created_at::TEXT, updated_at::TEXT, \
+    soul_content, scenarios, welcome_message, quick_commands, \
+    personality, communication_style, emoji, version, source_id";
+
+/// Plain column names for INSERT statements (no casts).
+const INSERT_COLUMNS: &str = "\
     id, name, description, category, source, model, system_prompt, \
     tools, capabilities, temperature, max_tokens, visibility, status, \
     current_version, created_at, updated_at, \
@@ -69,14 +77,14 @@ pub async fn create_template(
     source_id: Option<&str>,
 ) -> SaasResult<AgentTemplateInfo> {
     let id = uuid::Uuid::new_v4().to_string();
-    let now = chrono::Utc::now().to_rfc3339();
+    let now = chrono::Utc::now();
     let tools_json = serde_json::to_string(tools).unwrap_or_else(|_| "[]".to_string());
     let caps_json = serde_json::to_string(capabilities).unwrap_or_else(|_| "[]".to_string());
     let scenarios_json = serde_json::to_string(&scenarios.unwrap_or(&[])).unwrap_or_else(|_| "[]".to_string());
     let quick_commands_json = serde_json::to_string(&quick_commands.unwrap_or(&[])).unwrap_or_else(|_| "[]".to_string());
 
     sqlx::query(
-        &format!("INSERT INTO agent_templates ({}) VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,'active',1,$13,$13,$14,$15,$16,$17,$18,$19,$20,1,$21)", SELECT_COLUMNS)
+        &format!("INSERT INTO agent_templates ({}) VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,'active',1,$13,$13,$14,$15,$16,$17,$18,$19,$20,1,$21)", INSERT_COLUMNS)
     )
     .bind(&id)               // $1  id
     .bind(name)              // $2  name
@@ -209,7 +217,7 @@ pub async fn update_template(
     // Confirm existence
     get_template(db, id).await?;
 
-    let now = chrono::Utc::now().to_rfc3339();
+    let now = chrono::Utc::now();
 
     // Serialize JSON fields upfront so we can bind Option<&str> consistently
     let tools_json = tools.map(|t| serde_json::to_string(t).unwrap_or_else(|_| "[]".to_string()));
@@ -282,7 +290,7 @@ pub async fn assign_template_to_account(
         return Err(SaasError::InvalidInput("模板不可用（已归档）".into()));
     }
 
-    let now = chrono::Utc::now().to_rfc3339();
+    let now = chrono::Utc::now();
     sqlx::query(
         "UPDATE accounts SET assigned_template_id = $1, updated_at = $2 WHERE id = $3"
     )
@@ -317,7 +325,7 @@ pub async fn get_assigned_template(
         Ok(t) => Ok(Some(t)),
         Err(SaasError::NotFound(_)) => {
             // Template deleted — clear stale reference
-            let now = chrono::Utc::now().to_rfc3339();
+            let now = chrono::Utc::now();
             sqlx::query(
                 "UPDATE accounts SET assigned_template_id = NULL, updated_at = $1 WHERE id = $2"
             )
@@ -336,7 +344,7 @@ pub async fn unassign_template(
     db: &PgPool,
     account_id: &str,
 ) -> SaasResult<()> {
-    let now = chrono::Utc::now().to_rfc3339();
+    let now = chrono::Utc::now();
     sqlx::query(
         "UPDATE accounts SET assigned_template_id = NULL, updated_at = $1 WHERE id = $2"
     )