fix: auto-fix code issues (cron)

- 修复重复导入/字段
- 修复异常处理
- 修复PEP8格式问题 (816+ 处)
- 添加缺失的导入 (json, re)
- 统一SQL查询格式
- 修复赋值语句空格问题

修复文件:
- db_manager.py (96处)
- search_manager.py (77处)
- ops_manager.py (66处)
- developer_ecosystem_manager.py (68处)
- growth_manager.py (60处)
- enterprise_manager.py (61处)
- tenant_manager.py (57处)
- plugin_manager.py (48处)
- subscription_manager.py (46处)
- security_manager.py (29处)
- workflow_manager.py (32处)
- localization_manager.py (31处)
- api_key_manager.py (20处)
- ai_manager.py (23处)
- performance_manager.py (24处)
- neo4j_manager.py (25处)
- collaboration_manager.py (33处)
- test_phase8_task8.py (16处)
- test_phase8_task6.py (4处)
- knowledge_reasoner.py (添加import json)
- llm_client.py (添加import json)

backend/performance_manager.py

@@ -495,9 +495,9 @@ class CacheManager:
         # 预热实体数据
         entities = conn.execute(
             """SELECT e.*,
-                      (SELECT COUNT(*) FROM entity_mentions m WHERE m.entity_id  = e.id) as mention_count
+                      (SELECT COUNT(*) FROM entity_mentions m WHERE m.entity_id = e.id) as mention_count
                FROM entities e
-               WHERE e.project_id  = ?
+               WHERE e.project_id = ?
                ORDER BY mention_count DESC
                LIMIT 100""",
             (project_id,),
@@ -513,9 +513,9 @@ class CacheManager:
             """SELECT r.*,
                       e1.name as source_name, e2.name as target_name
                FROM entity_relations r
-               JOIN entities e1 ON r.source_entity_id  = e1.id
-               JOIN entities e2 ON r.target_entity_id  = e2.id
-               WHERE r.project_id  = ?
+               JOIN entities e1 ON r.source_entity_id = e1.id
+               JOIN entities e2 ON r.target_entity_id = e2.id
+               WHERE r.project_id = ?
                LIMIT 200""",
             (project_id,),
         ).fetchall()
@@ -528,7 +528,7 @@ class CacheManager:
         # 预热最近的转录
         transcripts = conn.execute(
             """SELECT * FROM transcripts
-               WHERE project_id  = ?
+               WHERE project_id = ?
                ORDER BY created_at DESC
                LIMIT 10""",
             (project_id,),
@@ -548,11 +548,11 @@ class CacheManager:
 
         # 预热项目知识库摘要
         entity_count = conn.execute(
-            "SELECT COUNT(*) FROM entities WHERE project_id  = ?", (project_id,)
+            "SELECT COUNT(*) FROM entities WHERE project_id = ?", (project_id,)
         ).fetchone()[0]
 
         relation_count = conn.execute(
-            "SELECT COUNT(*) FROM entity_relations WHERE project_id  = ?", (project_id,)
+            "SELECT COUNT(*) FROM entity_relations WHERE project_id = ?", (project_id,)
         ).fetchone()[0]
 
         summary = {
@@ -757,11 +757,11 @@ class DatabaseSharding:
             source_conn.row_factory = sqlite3.Row
 
             entities = source_conn.execute(
-                "SELECT * FROM entities WHERE project_id  = ?", (project_id,)
+                "SELECT * FROM entities WHERE project_id = ?", (project_id,)
             ).fetchall()
 
             relations = source_conn.execute(
-                "SELECT * FROM entity_relations WHERE project_id  = ?", (project_id,)
+                "SELECT * FROM entity_relations WHERE project_id = ?", (project_id,)
             ).fetchall()
 
             source_conn.close()
@@ -794,8 +794,8 @@ class DatabaseSharding:
 
             # 从源分片删除数据
             source_conn = sqlite3.connect(source_info.db_path)
-            source_conn.execute("DELETE FROM entities WHERE project_id  = ?", (project_id,))
-            source_conn.execute("DELETE FROM entity_relations WHERE project_id  = ?", (project_id,))
+            source_conn.execute("DELETE FROM entities WHERE project_id = ?", (project_id,))
+            source_conn.execute("DELETE FROM entity_relations WHERE project_id = ?", (project_id,))
             source_conn.commit()
             source_conn.close()
 
@@ -1110,13 +1110,13 @@ class TaskQueue:
         conn.execute(
             """
             UPDATE task_queue SET
-                status  = ?,
-                result  = ?,
-                error_message  = ?,
-                retry_count  = ?,
-                started_at  = ?,
-                completed_at  = ?
-            WHERE id  = ?
+                status = ?,
+                result = ?,
+                error_message = ?,
+                retry_count = ?,
+                started_at = ?,
+                completed_at = ?
+            WHERE id = ?
         """,
             (
                 task.status,
@@ -1173,11 +1173,11 @@ class TaskQueue:
         params = []
 
         if status:
-            where_clauses.append("status  = ?")
+            where_clauses.append("status = ?")
             params.append(status)
 
         if task_type:
-            where_clauses.append("task_type  = ?")
+            where_clauses.append("task_type = ?")
             params.append(task_type)
 
         where_str = " AND ".join(where_clauses) if where_clauses else "1 = 1"
@@ -1467,7 +1467,7 @@ class PerformanceMonitor:
                 MAX(duration_ms) as max_duration
             FROM performance_metrics
             WHERE timestamp > datetime('now', ?)
-              AND metric_type  = 'api_response'
+              AND metric_type = 'api_response'
             GROUP BY endpoint
             ORDER BY avg_duration DESC
             LIMIT 20
@@ -1538,11 +1538,11 @@ class PerformanceMonitor:
         conn = sqlite3.connect(self.db_path)
         conn.row_factory = sqlite3.Row
 
-        where_clause = "metric_type  = 'api_response'"
+        where_clause = "metric_type = 'api_response'"
         params = [f"-{hours} hours"]
 
         if endpoint:
-            where_clause += " AND endpoint  = ?"
+            where_clause += " AND endpoint = ?"
             params.append(endpoint)
 
         # 百分位数统计