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/search_manager.py

@@ -233,7 +233,8 @@ class FullTextSearch:
 
         # 创建索引
         conn.execute(
-            "CREATE INDEX IF NOT EXISTS idx_search_content ON search_indexes(content_id, content_type)",
+            """CREATE INDEX IF NOT EXISTS idx_search_content
+            ON search_indexes(content_id, content_type)""",
         )
         conn.execute("CREATE INDEX IF NOT EXISTS idx_search_project ON search_indexes(project_id)")
         conn.execute("CREATE INDEX IF NOT EXISTS idx_term_freq_term ON search_term_freq(term)")
@@ -310,7 +311,8 @@ class FullTextSearch:
             conn.execute(
                 """
                 INSERT OR REPLACE INTO search_indexes
-                (id, content_id, content_type, project_id, tokens, token_positions, created_at, updated_at)
+                (id, content_id, content_type, project_id, tokens, token_positions,
+                 created_at, updated_at)
                 VALUES (?, ?, ?, ?, ?, ?, ?, ?)
             """,
                 (
@@ -579,7 +581,10 @@ class FullTextSearch:
                     (content_id,),
                 ).fetchone()
                 if row:
-                    return f"{row['source_name']} {row['relation_type']} {row['target_name']} {row['evidence'] or ''}"
+                    return (
+                        f"{row['source_name']} {row['relation_type']} "
+                        f"{row['target_name']} {row['evidence'] or ''}"
+                    )
                 return None
 
             return None
@@ -784,7 +789,10 @@ class FullTextSearch:
             ).fetchall()
 
             for r in relations:
-                text = f"{r['source_name']} {r['relation_type']} {r['target_name']} {r['evidence'] or ''}"
+                text = (
+                    f"{r['source_name']} {r['relation_type']} "
+                    f"{r['target_name']} {r['evidence'] or ''}"
+                )
                 if self.index_content(r["id"], "relation", r["project_id"], text):
                     stats["relations"] += 1
                 else:
@@ -854,7 +862,8 @@ class SemanticSearch:
         """)
 
         conn.execute(
-            "CREATE INDEX IF NOT EXISTS idx_embedding_content ON embeddings(content_id, content_type)",
+            """CREATE INDEX IF NOT EXISTS idx_embedding_content
+            ON embeddings(content_id, content_type)""",
         )
         conn.execute("CREATE INDEX IF NOT EXISTS idx_embedding_project ON embeddings(project_id)")
 
@@ -1107,7 +1116,8 @@ class SemanticSearch:
         conn = self._get_conn()
 
         row = conn.execute(
-            "SELECT embedding, project_id FROM embeddings WHERE content_id = ? AND content_type = ?",
+            """SELECT embedding, project_id FROM embeddings
+            WHERE content_id = ? AND content_type = ?""",
             (content_id, content_type),
         ).fetchone()