feat: 添加Telegram Bot通知功能

✨ 新功能:
- 添加Telegram Bot通知支持
- 账目记录自动推送到Telegram
- 支持多个Bot配置管理
- 支持群组和个人通知

📊 数据库:
- 新增telegram_notification_configs表
- 存储Bot配置和通知类型

🔧 后端API:
- GET /api/telegram/notifications - 获取所有配置
- POST /api/telegram/notifications - 创建配置
- PUT /api/telegram/notifications/:id - 更新配置
- DELETE /api/telegram/notifications/:id - 删除配置
- POST /api/telegram/test - 测试Bot配置

💬 通知功能:
- 自动发送账目记录通知
- 包含交易类型、金额、分类、账户等信息
- 支持格式化显示(类型图标、状态标识)
- 配置创建时自动测试有效性

📝 文档:
- 添加完整的使用说明文档
- API接口说明和示例
- 常见问题解答

apps/backend/utils/telegram-bot.ts

@@ -0,0 +1,229 @@
+import db from './sqlite';
+
+interface TelegramNotificationConfig {
+  id: number;
+  name: string;
+  botToken: string;
+  chatId: string;
+  notificationTypes: string[];
+  isEnabled: boolean;
+}
+
+interface TransactionNotificationData {
+  id: number;
+  type: string;
+  amount: number;
+  currency: string;
+  categoryName?: string;
+  accountName?: string;
+  transactionDate: string;
+  description?: string;
+  status: string;
+}
+
+/**
+ * 获取所有启用的Telegram通知配置
+ */
+export function getEnabledNotificationConfigs(
+  notificationType: string = 'transaction',
+): TelegramNotificationConfig[] {
+  const rows = db
+    .prepare<{ id: number; name: string; bot_token: string; chat_id: string; notification_types: string; is_enabled: number }>(
+      `
+      SELECT id, name, bot_token, chat_id, notification_types, is_enabled
+      FROM telegram_notification_configs
+      WHERE is_enabled = 1
+    `,
+    )
+    .all();
+
+  return rows
+    .map((row) => ({
+      id: row.id,
+      name: row.name,
+      botToken: row.bot_token,
+      chatId: row.chat_id,
+      notificationTypes: JSON.parse(row.notification_types) as string[],
+      isEnabled: row.is_enabled === 1,
+    }))
+    .filter((config) => config.notificationTypes.includes(notificationType));
+}
+
+/**
+ * 格式化交易金额
+ */
+function formatAmount(amount: number, currency: string): string {
+  const formatted = amount.toLocaleString('zh-CN', {
+    minimumFractionDigits: 2,
+    maximumFractionDigits: 2,
+  });
+  return `${currency} ${formatted}`;
+}
+
+/**
+ * 格式化交易类型
+ */
+function formatTransactionType(type: string): string {
+  const typeMap: Record<string, string> = {
+    income: '💰 收入',
+    expense: '💸 支出',
+    transfer: '🔄 转账',
+  };
+  return typeMap[type] || type;
+}
+
+/**
+ * 格式化交易状态
+ */
+function formatTransactionStatus(status: string): string {
+  const statusMap: Record<string, string> = {
+    draft: '📝 草稿',
+    pending: '⏳ 待审核',
+    approved: '✅ 已批准',
+    rejected: '❌ 已拒绝',
+    paid: '💵 已支付',
+  };
+  return statusMap[status] || status;
+}
+
+/**
+ * 构建交易通知消息
+ */
+function buildTransactionMessage(
+  transaction: TransactionNotificationData,
+  action: string = 'created',
+): string {
+  const actionMap: Record<string, string> = {
+    created: '📋 新增账目记录',
+    updated: '✏️ 更新账目记录',
+    deleted: '🗑️ 删除账目记录',
+  };
+
+  const lines: string[] = [
+    `${actionMap[action] || '📋 账目记录'}`,
+    '',
+    `类型：${formatTransactionType(transaction.type)}`,
+    `金额：${formatAmount(transaction.amount, transaction.currency)}`,
+    `日期：${transaction.transactionDate}`,
+  ];
+
+  if (transaction.categoryName) {
+    lines.push(`分类：${transaction.categoryName}`);
+  }
+
+  if (transaction.accountName) {
+    lines.push(`账户：${transaction.accountName}`);
+  }
+
+  lines.push(`状态：${formatTransactionStatus(transaction.status)}`);
+
+  if (transaction.description) {
+    lines.push(``, `备注：${transaction.description}`);
+  }
+
+  lines.push(
+    ``,
+    `🕐 记录时间：${new Date().toLocaleString('zh-CN', { timeZone: 'Asia/Shanghai' })}`,
+  );
+
+  return lines.join('\n');
+}
+
+/**
+ * 发送Telegram消息
+ */
+async function sendTelegramMessage(
+  botToken: string,
+  chatId: string,
+  message: string,
+): Promise<boolean> {
+  try {
+    const url = `https://api.telegram.org/bot${botToken}/sendMessage`;
+    const response = await fetch(url, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        chat_id: chatId,
+        text: message,
+        parse_mode: 'HTML',
+      }),
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({}));
+      console.error(
+        '[telegram-bot] Failed to send message:',
+        response.status,
+        error,
+      );
+      return false;
+    }
+
+    return true;
+  } catch (error) {
+    console.error('[telegram-bot] Error sending message:', error);
+    return false;
+  }
+}
+
+/**
+ * 通知交易记录
+ */
+export async function notifyTransaction(
+  transaction: TransactionNotificationData,
+  action: string = 'created',
+): Promise<void> {
+  const configs = getEnabledNotificationConfigs('transaction');
+
+  if (configs.length === 0) {
+    console.log('[telegram-bot] No enabled notification configs found');
+    return;
+  }
+
+  const message = buildTransactionMessage(transaction, action);
+
+  const results = await Promise.allSettled(
+    configs.map((config) =>
+      sendTelegramMessage(config.botToken, config.chatId, message),
+    ),
+  );
+
+  results.forEach((result, index) => {
+    if (result.status === 'fulfilled' && result.value) {
+      console.log(
+        `[telegram-bot] Sent notification via config: ${configs[index].name}`,
+      );
+    } else {
+      console.error(
+        `[telegram-bot] Failed to send notification via config: ${configs[index].name}`,
+      );
+    }
+  });
+}
+
+/**
+ * 测试Telegram Bot配置
+ */
+export async function testTelegramConfig(
+  botToken: string,
+  chatId: string,
+): Promise<{ success: boolean; error?: string }> {
+  try {
+    const testMessage = `🤖 KT财务系统\n\n✅ Telegram通知配置测试成功！\n\n🕐 ${new Date().toLocaleString('zh-CN', { timeZone: 'Asia/Shanghai' })}`;
+
+    const success = await sendTelegramMessage(botToken, chatId, testMessage);
+
+    if (success) {
+      return { success: true };
+    } else {
+      return { success: false, error: '发送消息失败，请检查Bot Token和Chat ID' };
+    }
+  } catch (error: unknown) {
+    return {
+      success: false,
+      error: error instanceof Error ? error.message : '未知错误',
+    };
+  }
+}