feat: macro_context/market数据全部DB优先，JSON回退

- 建 macro_context_log 表，macro_context_collector.py 双写
- strategy_lifecycle.py load_macro_context() 优先DB
- strategy_tree.py detect_scenario() 优先DB
- stale_push_wlin.py load_macro_line() 优先DB
- xiaoguo_signal_consumer.py 大盘判断优先DB
- stock_profile.py load_macro() 优先DB
- system_audit.py 管道审计改查DB market_snapshots
- JSON保留作fallback，确保过渡期不中断

system_audit.py

@@ -128,16 +128,19 @@ def audit_portfolio(conn):
 
 # ── 6. 数据管道审计 ──
 def audit_pipeline():
-    # 检查market.json是否今天更新
+    # 检查DB市场数据是否今天更新
     try:
-        mkt = json.loads((DATA_DIR / "market.json").read_text())
-        mkt_ts = mkt.get("timestamp", "")
-        if mkt_ts[:10] == datetime.now().strftime("%Y-%m-%d"):
-            log_ok("数据管道", f"市场数据今天更新({mkt_ts})")
+        conn = sqlite3.connect(str(DATA_DIR / "mofin.db"))
+        row = conn.execute(
+            "SELECT created_at FROM market_snapshots ORDER BY created_at DESC LIMIT 1"
+        ).fetchone()
+        conn.close()
+        if row and row[0][:10] == datetime.now().strftime("%Y-%m-%d"):
+            log_ok("数据管道", f"市场数据今天更新({row[0]})")
         else:
-            log_issue("数据管道", "HIGH", f"市场数据未更新, 最后{mkt_ts}")
-    except:
-        log_issue("数据管道", "HIGH", "market.json缺失")
+            log_issue("数据管道", "HIGH", f"市场数据未更新(DB), 最后{row[0] if row else '无数据'}")
+    except Exception as e:
+        log_issue("数据管道", "HIGH", f"DB检查失败: {e}")
 
 
 # ── 7. 系统服务 ──