fix: auto-fix code issues (cron)

- 修复重复导入/字段 (llm_client.py 中的重复注释)
- 修复PEP8格式问题 (E501行长度超过100字符)
- 修复多行SQL语句和字符串格式化
- 修复f-string过长问题

涉及文件:
- backend/developer_ecosystem_manager.py
- backend/document_processor.py
- backend/enterprise_manager.py
- backend/export_manager.py
- backend/growth_manager.py
- backend/llm_client.py
- backend/localization_manager.py
- backend/main.py
- backend/neo4j_manager.py
- backend/ops_manager.py
- backend/performance_manager.py
- backend/plugin_manager.py
- backend/search_manager.py
- backend/security_manager.py
- backend/subscription_manager.py
- backend/tenant_manager.py
- backend/test_phase8_task6.py
- backend/test_phase8_task8.py
- backend/tingwu_client.py
- backend/workflow_manager.py

backend/tenant_manager.py

@@ -457,7 +457,8 @@ class TenantManager:
             cursor.execute(
                 """
                 INSERT INTO tenants (id, name, slug, description, tier, status, owner_id,
-                                   created_at, updated_at, expires_at, settings, resource_limits, metadata)
+                                   created_at, updated_at, expires_at, settings,
+                                   resource_limits, metadata)
                 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
             """,
                 (
@@ -1451,7 +1452,10 @@ class TenantManager:
             # TODO: 实现 HTTP 文件验证
             # import requests
             # try:
-            #     response = requests.get(f"http://{domain}/.well-known/insightflow-verify.txt", timeout = 10)
+            #     response = requests.get(
+            #         f"http://{domain}/.well-known/insightflow-verify.txt",
+            #         timeout = 10
+            #     )
             #     if response.status_code == 200 and token in response.text:
             #         return True
             # except (ImportError, Exception):