Add token expiry and Telegram notification features

- Introduced `STANDX_TOKEN_EXPIRY` configuration to manage token expiration, including handling logic for active, expired, and silent states.
- Implemented Telegram notifications for key events such as order filled, position opened/closed, stop loss triggered, and token expiration.
- Updated Maker Points engine to integrate token expiry checks and notification sending, enhancing user awareness of trading conditions.
- Enhanced documentation to include details on configuring token expiry and Telegram notifications for improved user guidance.

src/notifications/telegram.ts

@@ -0,0 +1,113 @@
+import type { NotificationSender, TradeNotification, NotificationConfig } from "./types";
+
+export interface TelegramConfig extends NotificationConfig {
+  botToken: string;
+  chatId: string;
+}
+
+const LEVEL_EMOJI: Record<string, string> = {
+  info: "ℹ️",
+  warn: "⚠️",
+  error: "🚨",
+  success: "✅",
+};
+
+const TYPE_EMOJI: Record<string, string> = {
+  order_filled: "📝",
+  position_opened: "📈",
+  position_closed: "📉",
+  stop_loss: "🛑",
+  token_expired: "⏰",
+  custom: "📢",
+};
+
+function formatNotificationMessage(notification: TradeNotification, accountLabel?: string): string {
+  const levelEmoji = LEVEL_EMOJI[notification.level] ?? "";
+  const typeEmoji = TYPE_EMOJI[notification.type] ?? "";
+  const timestamp = notification.timestamp ?? Date.now();
+  const time = new Date(timestamp).toISOString().replace("T", " ").substring(0, 19);
+
+  const label = notification.accountLabel ?? accountLabel ?? notification.symbol;
+
+  const lines: string[] = [
+    `${typeEmoji}${levelEmoji} [${label}] ${notification.title}`,
+    ``,
+    `${notification.message}`,
+  ];
+
+  if (notification.details && Object.keys(notification.details).length > 0) {
+    lines.push(``);
+    for (const [key, value] of Object.entries(notification.details)) {
+      if (value != null) {
+        lines.push(`• ${key}: ${value}`);
+      }
+    }
+  }
+
+  lines.push(``);
+  lines.push(`🕐 ${time} UTC`);
+  lines.push(`📊 ${notification.symbol}`);
+
+  return lines.join("\n");
+}
+
+export class TelegramNotifier implements NotificationSender {
+  private readonly config: TelegramConfig;
+  private readonly baseUrl: string;
+  private sendQueue: Promise<void> = Promise.resolve();
+
+  constructor(config: Partial<TelegramConfig> = {}) {
+    this.config = {
+      enabled: Boolean(config.botToken && config.chatId),
+      botToken: config.botToken ?? "",
+      chatId: config.chatId ?? "",
+      accountLabel: config.accountLabel,
+    };
+    this.baseUrl = `https://api.telegram.org/bot${this.config.botToken}`;
+  }
+
+  isEnabled(): boolean {
+    return this.config.enabled;
+  }
+
+  async send(notification: TradeNotification): Promise<void> {
+    if (!this.isEnabled()) {
+      return;
+    }
+
+    this.sendQueue = this.sendQueue
+      .then(() => this.doSend(notification))
+      .catch(() => {});
+  }
+
+  private async doSend(notification: TradeNotification): Promise<void> {
+    const text = formatNotificationMessage(notification, this.config.accountLabel);
+    const url = `${this.baseUrl}/sendMessage`;
+
+    try {
+      const response = await fetch(url, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({
+          chat_id: this.config.chatId,
+          text,
+        }),
+      });
+
+      if (!response.ok) {
+        const errorText = await response.text().catch(() => "unknown error");
+        console.error(`[Telegram] Failed to send notification: ${response.status} ${errorText}`);
+      }
+    } catch (error) {
+      console.error(`[Telegram] Failed to send notification: ${error instanceof Error ? error.message : String(error)}`);
+    }
+  }
+}
+
+export function createTelegramNotifier(): TelegramNotifier {
+  return new TelegramNotifier({
+    botToken: process.env.TELEGRAM_BOT_TOKEN,
+    chatId: process.env.TELEGRAM_CHAT_ID,
+    accountLabel: process.env.TELEGRAM_ACCOUNT_LABEL,
+  });
+}