fix: initialize IF_TRADE to True (trades expected by default)

Root cause: IF_TRADE was initialized to False and never updated when
trades executed, causing 'No trading' message to always display.

Design documents (2025-02-11-complete-schema-migration) specify
IF_TRADE should start as True, with trades setting it to False only
after completion.

Fixes sporadic issue where all trading sessions reported 'No trading'
despite successful buy/sell actions.

api/runtime_manager.py

@@ -80,7 +80,7 @@ class RuntimeConfigManager:
         initial_config = {
             "TODAY_DATE": date,
             "SIGNATURE": model_sig,
-            "IF_TRADE": False,
+            "IF_TRADE": True,  # FIX: Trades are expected by default
             "JOB_ID": job_id,
             "TRADING_DAY_ID": trading_day_id
         }