fix: 修复 market.py 北交所映射缺失和 analysis.py 3处连接泄漏

- market.py:488: 补充北交所(8/9开头)腾讯API代码映射
- analysis.py: ai_analyze_stream 获取数据 put_db 移到 finally，初始化 conn=None
- analysis.py: ai_analyze_stream AI日志 put_db 移到 finally，初始化 _conn=None
- analysis.py: ai_analyze 获取资金流向 put_db 移到 finally，初始化 conn=None

stock-html/routes/analysis.py

@@ -340,6 +340,7 @@ def ai_analyze_stream(stock_code):
         stock_name = get_stock_name(stock_code) or stock_code
         
         # 获取资金流向和技术信号
+        conn = None
         try:
             conn = get_db()
             if conn:
@@ -384,12 +385,14 @@ def ai_analyze_stream(stock_code):
                     stock_data['indicators'] = scan_row['indicators'] or {}
                     stock_data['triggered_count'] = scan_row['triggered_count'] or 0
                 cur2.close()
-
-                put_db(conn)
         except Exception as e:
             print(f"获取数据失败: {e}")
+        finally:
+            if conn:
+                put_db(conn)
 
         # 记录AI调用日志
+        _conn = None
         try:
             from flask import session as _sess
             _uid = _sess.get('user_id')
@@ -400,9 +403,11 @@ def ai_analyze_stream(stock_code):
                     _cur.execute("INSERT INTO ai_call_log (user_id, stock_code, stock_name) VALUES (%s, %s, %s)",
                                  (_uid, stock_code, stock_name))
                     _conn.commit()
-                    put_db(_conn)
         except Exception:
             pass
+        finally:
+            if _conn:
+                put_db(_conn)
 
         # 流式调用AI
         for chunk in analyze_stock_stream(stock_code, stock_name, stock_data):
@@ -447,6 +452,7 @@ def ai_analyze(stock_code):
         stock_name = get_stock_name(stock_code) or stock_code
         
         # 获取近三日资金流向
+        conn = None
         try:
             conn = get_db()
             if conn:
@@ -468,9 +474,11 @@ def ai_analyze(stock_code):
                         'super_pct': float(row[3]) if row[3] else 0,
                     })
                 stock_data['fund_flow_3days'] = fund_flow
-                put_db(conn)
         except Exception as e:
             print(f"获取资金流向失败: {e}")
+        finally:
+            if conn:
+                put_db(conn)
         
         # 调用AI分析
         result = analyze_stock(stock_code, stock_name, stock_data)

stock-html/routes/market.py

@@ -485,7 +485,7 @@ def get_fundamental(stock_code):
             # 备用方案：先试腾讯API，再试akshare
             try:
                 import requests as _rq
-                _tc = ('sh' if stock_code.startswith('6') else 'sz') + stock_code
+                _tc = ('sh' if stock_code.startswith('6') else 'bj' if stock_code.startswith(('8', '9')) else 'sz') + stock_code
                 _rr = _rq.get(f'http://qt.gtimg.cn/q={_tc}', timeout=5,
                               headers={'Referer': 'https://finance.qq.com'})
                 if _rr.status_code == 200 and '\"' in _rr.text: