Expose sim/live matching mode in env config UI.

Saving SIM_DEFAULT_MODE also switches runtime trading.mode immediately.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/sim/mode_lib.py

@@ -20,6 +20,34 @@ def default_trading_mode() -> str:
     return MODE_SIM
 
 
+def peek_persisted_trading_mode(db_path: str | None = None) -> str | None:
+    """只读 SQLite 中的 trading.mode(供 env 配置页展示当前生效值)."""
+    import sqlite3
+
+    path = (db_path or os.getenv("DB_PATH") or "crypto.db").strip()
+    if not path:
+        return None
+    if not os.path.isabs(path):
+        path = os.path.abspath(path)
+    if not os.path.isfile(path):
+        return None
+    try:
+        conn = sqlite3.connect(path, timeout=2)
+        try:
+            row = conn.execute(
+                "SELECT value FROM app_runtime_settings WHERE key=?",
+                (TRADING_MODE_KEY,),
+            ).fetchone()
+        finally:
+            conn.close()
+    except Exception:
+        return None
+    if not row:
+        return None
+    m = str(row[0] or "").strip().lower()
+    return m if m in VALID_MODES else None
+
+
 def normalize_mode(mode: str | None) -> str:
     m = (mode or "").strip().lower()
     if m in VALID_MODES: