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/monitor.go

@@ -0,0 +1,200 @@
+package assistant
+
+import (
+	"fmt"
+	"nofx/logger"
+	"nofx/manager"
+	"nofx/store"
+	"sync"
+	"time"
+)
+
+// Monitor provides proactive monitoring and alerts
+type Monitor struct {
+	traderManager  *manager.TraderManager
+	store          *store.Store
+	contextBuilder *ContextBuilder
+	
+	// Alert callbacks
+	alertCallbacks []func(Alert)
+	callbackMu     sync.RWMutex
+	
+	// State
+	running    bool
+	stopChan   chan struct{}
+	interval   time.Duration
+	
+	// Last known state for change detection
+	lastPositions map[string]PositionSummary
+	lastAlerts    map[string]time.Time // Prevent alert spam
+	mu            sync.RWMutex
+}
+
+// NewMonitor creates a new trading monitor
+func NewMonitor(tm *manager.TraderManager, st *store.Store) *Monitor {
+	return &Monitor{
+		traderManager:  tm,
+		store:          st,
+		contextBuilder: NewContextBuilder(tm, st),
+		stopChan:       make(chan struct{}),
+		interval:       30 * time.Second, // Check every 30 seconds
+		lastPositions:  make(map[string]PositionSummary),
+		lastAlerts:     make(map[string]time.Time),
+	}
+}
+
+// OnAlert registers an alert callback
+func (m *Monitor) OnAlert(callback func(Alert)) {
+	m.callbackMu.Lock()
+	defer m.callbackMu.Unlock()
+	m.alertCallbacks = append(m.alertCallbacks, callback)
+}
+
+// Start starts the monitor
+func (m *Monitor) Start() {
+	m.mu.Lock()
+	if m.running {
+		m.mu.Unlock()
+		return
+	}
+	m.running = true
+	m.stopChan = make(chan struct{})
+	m.mu.Unlock()
+	
+	logger.Info("🔍 Starting trading monitor...")
+	
+	go m.monitorLoop()
+}
+
+// Stop stops the monitor
+func (m *Monitor) Stop() {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	
+	if !m.running {
+		return
+	}
+	
+	m.running = false
+	close(m.stopChan)
+	logger.Info("🔍 Trading monitor stopped")
+}
+
+// monitorLoop is the main monitoring loop
+func (m *Monitor) monitorLoop() {
+	ticker := time.NewTicker(m.interval)
+	defer ticker.Stop()
+	
+	// Initial check
+	m.checkAndAlert()
+	
+	for {
+		select {
+		case <-ticker.C:
+			m.checkAndAlert()
+		case <-m.stopChan:
+			return
+		}
+	}
+}
+
+// checkAndAlert checks positions and sends alerts
+func (m *Monitor) checkAndAlert() {
+	ctx := m.contextBuilder.BuildContext()
+	
+	// Process built-in alerts from context
+	for _, alert := range ctx.Alerts {
+		m.sendAlertIfNew(alert)
+	}
+	
+	// Check for position changes
+	m.checkPositionChanges(ctx)
+	
+	// Check for new large movements
+	m.checkMarketMovements(ctx)
+}
+
+// checkPositionChanges detects significant position changes
+func (m *Monitor) checkPositionChanges(ctx *TradingContext) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	
+	currentPositions := make(map[string]PositionSummary)
+	
+	for _, pos := range ctx.Positions {
+		key := fmt.Sprintf("%s_%s_%s", pos.TraderID, pos.Symbol, pos.Side)
+		currentPositions[key] = pos
+		
+		// Check if this is a new position
+		if _, existed := m.lastPositions[key]; !existed {
+			m.sendAlert(Alert{
+				Level:   "info",
+				Type:    "new_position",
+				Message: fmt.Sprintf("📍 新开仓位: %s %s %.4f @ %.2f (%dx)", 
+					pos.Symbol, pos.Side, pos.Size, pos.EntryPrice, pos.Leverage),
+			})
+		}
+	}
+	
+	// Check for closed positions
+	for key, oldPos := range m.lastPositions {
+		if _, exists := currentPositions[key]; !exists {
+			m.sendAlert(Alert{
+				Level:   "info",
+				Type:    "position_closed",
+				Message: fmt.Sprintf("📍 仓位已平: %s %s (入场价: %.2f)", 
+					oldPos.Symbol, oldPos.Side, oldPos.EntryPrice),
+			})
+		}
+	}
+	
+	m.lastPositions = currentPositions
+}
+
+// checkMarketMovements checks for significant market movements
+func (m *Monitor) checkMarketMovements(ctx *TradingContext) {
+	// This could be expanded to check price movements
+	// For now, we rely on the context builder's alerts
+}
+
+// sendAlertIfNew sends an alert only if it's new (avoid spam)
+func (m *Monitor) sendAlertIfNew(alert Alert) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	
+	key := fmt.Sprintf("%s_%s", alert.Type, alert.Message)
+	
+	// Check if we sent this alert recently (within 5 minutes)
+	if lastSent, ok := m.lastAlerts[key]; ok {
+		if time.Since(lastSent) < 5*time.Minute {
+			return // Skip, already sent recently
+		}
+	}
+	
+	m.lastAlerts[key] = time.Now()
+	m.sendAlert(alert)
+}
+
+// sendAlert sends alert to all registered callbacks
+func (m *Monitor) sendAlert(alert Alert) {
+	m.callbackMu.RLock()
+	callbacks := make([]func(Alert), len(m.alertCallbacks))
+	copy(callbacks, m.alertCallbacks)
+	m.callbackMu.RUnlock()
+	
+	for _, cb := range callbacks {
+		go cb(alert)
+	}
+}
+
+// GetCurrentContext returns the current trading context
+func (m *Monitor) GetCurrentContext() *TradingContext {
+	return m.contextBuilder.BuildContext()
+}
+
+// SetInterval sets the monitoring interval
+func (m *Monitor) SetInterval(d time.Duration) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.interval = d
+}