Add READ_ONLY_API environment variable and enhance trading error handling

routers/health.py

@@ -1,3 +1,5 @@
+import os
+
 from fastapi import APIRouter
 from fastapi.responses import JSONResponse
 
@@ -10,6 +12,7 @@ router = APIRouter()
 async def health():
     ib_connected = False
     account = None
+    trading_mode = os.getenv("TRADING_MODE", "unknown").split("#", 1)[0].strip() or "unknown"
     try:
         ib_inst = dependencies.get_ib()
         ib_connected = ib_inst.isConnected()
@@ -30,6 +33,7 @@ async def health():
         {
             "status": "ok" if (ib_connected and db_ok) else "degraded",
             "ib_connected": ib_connected,
+            "trading_mode": trading_mode,
             "account": account,
             "db_ok": db_ok,
             "version": "3.0",