feat(telegram): add AI agent bot with streaming and account context

- Add Telegram bot with long-polling and AI agent loop (api_call tool)
- SSE streaming with real-time message editing and ⏳ placeholder
- Account state injection at conversation start (models, exchanges,
  strategies, traders, per-trader PnL and statistics)
- Lane semaphore per chat serializes concurrent messages (60s timeout)
- Idle timeout watchdog (60s) prevents hung streaming connections
- Look-ahead buffer prevents partial <api_call> tag leaking to user
- Fix PUT /strategies/:id to merge config (read-then-merge pattern)
- Add route registry with full API schema for LLM documentation
- Add TelegramConfig store and Web UI config modal
- Add GetAnyEnabled to AIModel store for bot LLM client selection

store/telegram_config.go

@@ -0,0 +1,135 @@
+package store
+
+import (
+	"errors"
+	"fmt"
+	"sync"
+	"time"
+
+	"gorm.io/gorm"
+)
+
+// TelegramConfig stores the Telegram bot binding (single row, always ID=1)
+type TelegramConfig struct {
+	ID        uint      `gorm:"primaryKey"`
+	BotToken  string    `gorm:"column:bot_token"`
+	ChatID    int64     `gorm:"column:chat_id"`
+	Username  string    `gorm:"column:username"` // @username for display
+	BoundAt   time.Time `gorm:"column:bound_at"`
+	ModelID   string    `gorm:"column:model_id;default:''"` // AI model used for Telegram replies
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+// String returns a safe string representation of TelegramConfig with the token masked.
+func (tc TelegramConfig) String() string {
+	token := "***"
+	if tc.BotToken == "" {
+		token = "<not set>"
+	}
+	return fmt.Sprintf("TelegramConfig{ID:%d, ChatID:%d, Username:%q, BotToken:%s, BoundAt:%v}",
+		tc.ID, tc.ChatID, tc.Username, token, tc.BoundAt)
+}
+
+// TelegramConfigStore defines the interface for Telegram bot binding operations
+type TelegramConfigStore interface {
+	Get() (*TelegramConfig, error)                    // Get current config (may not exist)
+	SaveToken(botToken string) error                  // Save bot token only (Web UI sets this)
+	Save(botToken, modelID string) error              // Save bot token + selected AI model
+	BindUser(chatID int64, username string) error     // Called on first /start
+	IsBound() (bool, error)                           // Check if any user is bound
+	GetBoundChatID() (int64, error)                   // Get bound chat ID (0 if not bound)
+	Unbind() error                                    // Remove binding
+}
+
+type telegramConfigStore struct {
+	db *gorm.DB
+	mu sync.RWMutex
+}
+
+// NewTelegramConfigStore creates a new TelegramConfigStore
+func NewTelegramConfigStore(db *gorm.DB) TelegramConfigStore {
+	return &telegramConfigStore{db: db}
+}
+
+func (s *telegramConfigStore) initTables() error {
+	return s.db.AutoMigrate(&TelegramConfig{})
+}
+
+func (s *telegramConfigStore) Get() (*TelegramConfig, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	var cfg TelegramConfig
+	if err := s.db.First(&cfg, 1).Error; err != nil {
+		return nil, err
+	}
+	return &cfg, nil
+}
+
+func (s *telegramConfigStore) SaveToken(botToken string) error {
+	return s.Save(botToken, "")
+}
+
+func (s *telegramConfigStore) Save(botToken, modelID string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	var cfg TelegramConfig
+	result := s.db.First(&cfg, 1)
+	if result.Error != nil && !errors.Is(result.Error, gorm.ErrRecordNotFound) {
+		return result.Error
+	}
+	cfg.ID = 1
+	cfg.BotToken = botToken
+	cfg.ModelID = modelID
+	return s.db.Save(&cfg).Error
+}
+
+func (s *telegramConfigStore) BindUser(chatID int64, username string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	var cfg TelegramConfig
+	result := s.db.First(&cfg, 1)
+	if result.Error != nil && !errors.Is(result.Error, gorm.ErrRecordNotFound) {
+		return result.Error
+	}
+	cfg.ID = 1
+	cfg.ChatID = chatID
+	cfg.Username = username
+	cfg.BoundAt = time.Now()
+	return s.db.Save(&cfg).Error
+}
+
+func (s *telegramConfigStore) IsBound() (bool, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	var cfg TelegramConfig
+	if err := s.db.First(&cfg, 1).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return false, nil
+		}
+		return false, err
+	}
+	return cfg.ChatID != 0, nil
+}
+
+func (s *telegramConfigStore) GetBoundChatID() (int64, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	var cfg TelegramConfig
+	if err := s.db.First(&cfg, 1).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return 0, nil
+		}
+		return 0, err
+	}
+	return cfg.ChatID, nil
+}
+
+func (s *telegramConfigStore) Unbind() error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.db.Model(&TelegramConfig{}).Where("id = 1").Updates(map[string]interface{}{
+		"chat_id":  0,
+		"username": "",
+	}).Error
+}