feat: add OI ranking data support and fix trader config update issues

- Add OI ranking data fetching and formatting for AI prompts
- Fix trader update not saving strategy_id, ai_model_id, initial_balance
- Fix AI API key not set for non-qwen/deepseek providers
- Add strategy_id to trader config API response
- Remove old trader from memory before reloading on update
- Clean up unused useTraderActions.ts

debate/engine.go

@@ -182,7 +182,7 @@ func (e *DebateEngine) runDebate(session *store.DebateSessionWithDetails, strate
 	// Build system prompt based on strategy (same as AI Test)
 	baseSystemPrompt := strategyEngine.BuildSystemPrompt(1000.0, session.PromptVariant)
 
-	// Build user prompt with market data
+	// Build user prompt with market data (OI ranking data is included via ctx.OIRankingData)
 	userPrompt := strategyEngine.BuildUserPrompt(ctx)
 
 	// Run debate rounds
@@ -332,6 +332,9 @@ func (e *DebateEngine) buildMarketContext(session *store.DebateSessionWithDetail
 	}
 	quantDataMap := strategyEngine.FetchQuantDataBatch(symbols)
 
+	// Fetch OI ranking data (market-wide position changes)
+	oiRankingData := strategyEngine.FetchOIRankingData()
+
 	// Build context
 	ctx := &decision.Context{
 		CurrentTime:    time.Now().UTC().Format("2006-01-02 15:04:05 UTC"),
@@ -352,6 +355,7 @@ func (e *DebateEngine) buildMarketContext(session *store.DebateSessionWithDetail
 		PromptVariant:  session.PromptVariant,
 		MarketDataMap:  marketDataMap,
 		QuantDataMap:   quantDataMap,
+		OIRankingData:  oiRankingData,
 	}
 
 	return ctx, nil