refactor: 消费者切 SQLite 优先读取

切换策略: SQLite 优先 → 失败回退 JSON

price_events (100%覆盖):
- strategy_feedback.py: run() 优先 query_price_events()
- system_health_check.py: 优先 query_price_events() + query_price_events_by_date()

stock_sector_map (100%覆盖):
- strategy_lifecycle.py: load_stock_sector_map() 优先 stock_sectors 表

market.json (85%覆盖):
- strategy_lifecycle.py: load_market_context() 优先 query_latest_market()
- market_insight.py: generate() 优先 query_latest_market()

portfolio.json + watchlist.json (70%覆盖):
- strategy_lifecycle.py: regenerate_all() 优先 query_holdings() + query_watchlist()
- server.py: /api/portfolio, /api/watchlist, /api/overview, /api/market 优先 SQLite

所有改动保留 JSON 回退路径，SQLite 不可用时自动降级

system_health_check.py

@@ -110,13 +110,20 @@ def run():
     # 4. 价格事件统计
     lines.append("")
     lines.append("【价格事件】")
-    events = load_json(EVENTS_PATH, {"events": []})
-    ev_list = events.get("events", [])
-    today_events = [e for e in ev_list if e.get("date") == now.strftime("%Y-%m-%d")]
+    try:
+        from mofin_db import get_conn, query_price_events, query_price_events_by_date
+        conn = get_conn()
+        ev_list = query_price_events(conn, limit=50000)
+        today_events = query_price_events_by_date(conn, now.strftime("%Y-%m-%d"))
+        conn.close()
+    except Exception:
+        events = load_json(EVENTS_PATH, {"events": []})
+        ev_list = events.get("events", [])
+        today_events = [e for e in ev_list if e.get("date") == now.strftime("%Y-%m-%d")]
     lines.append(check(len(ev_list) > 0, f"历史事件: {len(ev_list)}条"))
     lines.append(check(len(today_events) > 0, f"今日事件: {len(today_events)}条"))
     if len(ev_list) == 0:
-        issues.append("price_events.json 无事件记录，price_monitor可能未触发过")
+        issues.append("price_events 无事件记录，price_monitor可能未触发过")
         warn_count += 1
     else:
         ok_count += 1