fix: prevent DeepSeek token overflow with product-level limits (#1431)

* feat: enforce strategy limits to prevent token overflow

* fix: tune token limits after real-world testing

- Relax kline max 20→30, timeframes 3→4 (tested ~41K tokens, safe under 131K)
- Restore ranking limits to original [5,10,15,20] options (only ~1.5K token impact)
- Add static coins limit (max 3) with toast notification
- Add timeframe limit toast when exceeding 4
- Log SSE token usage (prompt/completion/total) from API response
- Fix nil logger crash in claw402 data client (engine.go)

* feat: add token estimation functionality for strategy configurations

* feat: add discard changes button in Strategy Studio for unsaved modifications

* feat: retain selected strategy after saving in Strategy Studio

* feat: enhance strategy display in Strategy Studio with improved layout and sorting of token limits

* refactor: improve layout and styling of stats display in CompetitionPage

* refactor: replace select elements with NofxSelect component for improved consistency in strategy configuration forms

* style: update NofxSelect component to use smaller text size for improved readability

* feat: implement token overflow handling in strategy updates and UI

---------

Co-authored-by: Dean <afei.wuhao@gmail.com>

kernel/engine.go

@@ -209,7 +209,7 @@ func NewStrategyEngine(config *store.StrategyConfig, claw402WalletKey ...string)
 		if claw402URL == "" {
 			claw402URL = "https://claw402.ai"
 		}
-		claw402Client, err := nofxos.NewClaw402DataClient(claw402URL, walletKey, nil)
+		claw402Client, err := nofxos.NewClaw402DataClient(claw402URL, walletKey, &logger.MCPLogger{})
 		if err == nil {
 			client.SetClaw402(claw402Client)
 			logger.Infof("🔗 NofxOS data routed through claw402 (%s)", claw402URL)

kernel/engine_analysis.go

@@ -51,6 +51,30 @@ func GetFullDecisionWithStrategy(ctx *Context, mcpClient mcp.AIClient, engine *S
 		engine = NewStrategyEngine(&defaultConfig)
 	}
 
+	// Clamp strategy limits to prevent token overflow
+	engineConfig := engine.GetConfig()
+	engineConfig.ClampLimits()
+
+	// Token estimation check — warn or block if exceeding all known model limits
+	estimate := engineConfig.EstimateTokens()
+	allExceed := true
+	anyWarning := false
+	for _, ml := range estimate.ModelLimits {
+		if ml.UsagePct <= 100 {
+			allExceed = false
+		}
+		if ml.UsagePct >= 80 {
+			anyWarning = true
+		}
+	}
+	if allExceed && len(estimate.ModelLimits) > 0 {
+		logger.Errorf("🚫 Token estimate %d exceeds ALL known model context limits — blocking analysis", estimate.Total)
+		return nil, fmt.Errorf("estimated %d tokens exceeds all known model context limits; reduce coins, timeframes, or K-line count", estimate.Total)
+	}
+	if anyWarning {
+		logger.Infof("⚠️  Token estimate %d — approaching context limits for some models", estimate.Total)
+	}
+
 	// 1. Fetch market data using strategy config
 	if len(ctx.MarketDataMap) == 0 {
 		if err := fetchMarketDataWithStrategy(ctx, engine); err != nil {