feat: Add smart trading assistant with context awareness

- Add SmartAgent with automatic context injection
  - Real-time portfolio/position data in every prompt
  - AI knows current state before responding

- Add TradingContext builder
  - Aggregates balance, positions, P&L across all traders
  - Auto-generates alerts (liquidation risk, large loss, etc.)

- Add background Monitor
  - Proactive position monitoring every 30s
  - Detects new positions, closed positions
  - Forwards alerts to Telegram

- Enhanced system prompts
  - Professional trading assistant persona
  - Risk assessment guidelines
  - Clear response formatting rules

Features:
✅ Context-aware responses
✅ Proactive risk alerts
✅ Background monitoring
✅ Alert broadcasting to Telegram

assistant/smart_agent.go

@@ -0,0 +1,216 @@
+package assistant
+
+import (
+	"context"
+	"fmt"
+	"nofx/logger"
+	"nofx/manager"
+	"nofx/mcp"
+	"nofx/store"
+	"strings"
+	"time"
+)
+
+// SmartAgent is an enhanced AI agent with trading context awareness
+type SmartAgent struct {
+	*Agent
+	contextBuilder *ContextBuilder
+	monitor        *Monitor
+	
+	// Auto-inject context into prompts
+	autoInjectContext bool
+}
+
+// NewSmartAgent creates a new smart trading agent
+func NewSmartAgent(aiClient mcp.AIClient, config AgentConfig, tm *manager.TraderManager, st *store.Store) *SmartAgent {
+	baseAgent := NewAgent(aiClient, config)
+	baseAgent.SetSystemPrompt(SmartTradingPrompt())
+	
+	contextBuilder := NewContextBuilder(tm, st)
+	monitor := NewMonitor(tm, st)
+	
+	return &SmartAgent{
+		Agent:             baseAgent,
+		contextBuilder:    contextBuilder,
+		monitor:           monitor,
+		autoInjectContext: true,
+	}
+}
+
+// SetAutoInjectContext enables/disables automatic context injection
+func (sa *SmartAgent) SetAutoInjectContext(enabled bool) {
+	sa.autoInjectContext = enabled
+}
+
+// StartMonitor starts the background monitor
+func (sa *SmartAgent) StartMonitor() {
+	sa.monitor.Start()
+}
+
+// StopMonitor stops the background monitor
+func (sa *SmartAgent) StopMonitor() {
+	sa.monitor.Stop()
+}
+
+// OnAlert registers an alert callback
+func (sa *SmartAgent) OnAlert(callback func(Alert)) {
+	sa.monitor.OnAlert(callback)
+}
+
+// Chat processes a message with smart context injection
+func (sa *SmartAgent) Chat(ctx context.Context, sessionID string, userMessage string) (*AgentResponse, error) {
+	session := sa.GetSession(sessionID)
+	
+	// Add user message to history
+	session.AddMessage(Message{
+		Role:      "user",
+		Content:   userMessage,
+		Timestamp: time.Now(),
+	})
+	
+	// Build system prompt with tools
+	systemPrompt := sa.buildSmartSystemPrompt()
+	
+	// Build conversation prompt with context injection
+	conversationPrompt := sa.buildSmartConversationPrompt(session, userMessage)
+	
+	// Agent loop
+	var finalResponse string
+	toolCallCount := 0
+	
+	for {
+		if ctx.Err() != nil {
+			return nil, ctx.Err()
+		}
+		
+		if toolCallCount >= sa.config.MaxToolCalls {
+			logger.Warnf("⚠️ Max tool calls reached (%d)", sa.config.MaxToolCalls)
+			break
+		}
+		
+		response, err := sa.aiClient.CallWithMessages(systemPrompt, conversationPrompt)
+		if err != nil {
+			return nil, fmt.Errorf("AI call failed: %w", err)
+		}
+		
+		toolCalls, textResponse, err := sa.parseResponse(response)
+		if err != nil {
+			finalResponse = response
+			break
+		}
+		
+		if len(toolCalls) == 0 {
+			finalResponse = textResponse
+			break
+		}
+		
+		// Execute tool calls
+		toolResults := sa.executeToolCalls(ctx, toolCalls)
+		toolCallCount += len(toolCalls)
+		
+		// Add results to conversation
+		conversationPrompt += fmt.Sprintf("\n\nAssistant called tools:\n%s\n\nTool results:\n%s\n\nBased on the tool results, provide a helpful response:",
+			formatToolCalls(toolCalls),
+			formatToolResults(toolResults))
+		
+		if textResponse != "" {
+			finalResponse = textResponse
+		}
+	}
+	
+	// Add response to history
+	session.AddMessage(Message{
+		Role:      "assistant",
+		Content:   finalResponse,
+		Timestamp: time.Now(),
+	})
+	
+	return &AgentResponse{
+		Text:      finalResponse,
+		SessionID: sessionID,
+	}, nil
+}
+
+// buildSmartSystemPrompt builds system prompt with tools
+func (sa *SmartAgent) buildSmartSystemPrompt() string {
+	sa.toolsLock.RLock()
+	defer sa.toolsLock.RUnlock()
+	
+	var toolDefs []string
+	for _, tool := range sa.tools {
+		toolDef := fmt.Sprintf(`- **%s**: %s
+  Parameters: %s`, tool.Name(), tool.Description(), tool.ParameterSchema())
+		toolDefs = append(toolDefs, toolDef)
+	}
+	
+	toolsSection := ""
+	if len(toolDefs) > 0 {
+		toolsSection = fmt.Sprintf(`
+
+## 可用工具
+
+调用工具时，使用以下 JSON 格式:
+{"tool_calls": [{"name": "工具名", "arguments": {"参数": "值"}}]}
+
+收到工具结果后，用自然语言回复用户。
+
+可用工具:
+%s
+`, strings.Join(toolDefs, "\n"))
+	}
+	
+	return sa.systemPrompt + toolsSection
+}
+
+// buildSmartConversationPrompt builds conversation with context injection
+func (sa *SmartAgent) buildSmartConversationPrompt(session *Session, currentMessage string) string {
+	var sb strings.Builder
+	
+	// Inject current trading context if enabled
+	if sa.autoInjectContext {
+		tradingCtx := sa.contextBuilder.BuildContext()
+		sb.WriteString(tradingCtx.FormatContextForPrompt())
+	}
+	
+	// Add conversation history
+	messages := session.GetMessages()
+	for _, msg := range messages {
+		sb.WriteString(fmt.Sprintf("\n%s: %s\n", strings.Title(msg.Role), msg.Content))
+	}
+	
+	return sb.String()
+}
+
+// QuickStatus returns a quick status summary
+func (sa *SmartAgent) QuickStatus() string {
+	ctx := sa.contextBuilder.BuildContext()
+	
+	var sb strings.Builder
+	sb.WriteString("📊 **交易状态概览**\n\n")
+	
+	sb.WriteString(fmt.Sprintf("💰 总权益: $%.2f\n", ctx.TotalEquity))
+	sb.WriteString(fmt.Sprintf("💵 可用余额: $%.2f\n", ctx.AvailableBalance))
+	
+	if ctx.UnrealizedPnL >= 0 {
+		sb.WriteString(fmt.Sprintf("📈 未实现盈亏: 🟢 +$%.2f\n", ctx.UnrealizedPnL))
+	} else {
+		sb.WriteString(fmt.Sprintf("📉 未实现盈亏: 🔴 $%.2f\n", ctx.UnrealizedPnL))
+	}
+	
+	sb.WriteString(fmt.Sprintf("📍 持仓数: %d\n", len(ctx.Positions)))
+	sb.WriteString(fmt.Sprintf("🤖 运行交易员: %d\n", len(ctx.ActiveTraders)))
+	
+	if len(ctx.Alerts) > 0 {
+		sb.WriteString("\n⚠️ **警报**\n")
+		for _, alert := range ctx.Alerts {
+			sb.WriteString(fmt.Sprintf("- %s\n", alert.Message))
+		}
+	}
+	
+	return sb.String()
+}
+
+// GetTradingContext returns current trading context
+func (sa *SmartAgent) GetTradingContext() *TradingContext {
+	return sa.contextBuilder.BuildContext()
+}