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

stock_profile.py

@@ -119,7 +119,21 @@ def load_mtf_cache() -> dict:
 
 
 def load_macro() -> dict:
-    """加载宏观上下文"""
+    """加载宏观上下文，优先DB"""
+    try:
+        import sqlite3
+        conn = sqlite3.connect(os.path.join(DATA_DIR, "mofin.db"))
+        row = conn.execute(
+            "SELECT indices, structure, key_sectors FROM macro_context_log "
+            "WHERE has_valid_data=1 ORDER BY created_at DESC LIMIT 1"
+        ).fetchone()
+        conn.close()
+        if row:
+            return {"indices": json.loads(row[0] or "{}"),
+                    "structure": json.loads(row[1] or "{}"),
+                    "key_sectors": json.loads(row[2] or "[]")}
+    except:
+        pass
     try:
         with open(MACRO_PATH) as f:
             return json.load(f)