修复：恢复 PostgreSQL 集成测试并规范工单搜索条件

apps/backend/src/db/postgres.integration.test.ts

@@ -35,7 +35,7 @@ test(
     const tableName = `integration_webhook_${Date.now()}`
     try {
       await pool.query(
-        `CREATE TEMP TABLE ${tableName} (
+        `CREATE TABLE ${tableName} (
         id serial primary key,
         provider text not null,
         event_id text not null,
@@ -54,6 +54,7 @@ test(
       const result = await pool.query(`SELECT COUNT(*)::int AS count FROM ${tableName}`)
       assert.equal(result.rows[0].count, 1)
     } finally {
+      await pool.query(`DROP TABLE IF EXISTS ${tableName}`)
       await pool.end()
     }
   },