fix: align telegram token resolution

src/telegram/token.ts

@@ -0,0 +1,50 @@
+import fs from "node:fs";
+
+import type { ClawdisConfig } from "../config/config.js";
+
+export type TelegramTokenSource = "env" | "tokenFile" | "config" | "none";
+
+export type TelegramTokenResolution = {
+  token: string;
+  source: TelegramTokenSource;
+};
+
+type ResolveTelegramTokenOpts = {
+  envToken?: string | null;
+  logMissingFile?: (message: string) => void;
+};
+
+export function resolveTelegramToken(
+  cfg?: ClawdisConfig,
+  opts: ResolveTelegramTokenOpts = {},
+): TelegramTokenResolution {
+  const envToken = (opts.envToken ?? process.env.TELEGRAM_BOT_TOKEN)?.trim();
+  if (envToken) {
+    return { token: envToken, source: "env" };
+  }
+
+  const tokenFile = cfg?.telegram?.tokenFile?.trim();
+  if (tokenFile) {
+    if (!fs.existsSync(tokenFile)) {
+      opts.logMissingFile?.(`telegram.tokenFile not found: ${tokenFile}`);
+      return { token: "", source: "none" };
+    }
+    try {
+      const token = fs.readFileSync(tokenFile, "utf-8").trim();
+      if (token) {
+        return { token, source: "tokenFile" };
+      }
+    } catch (err) {
+      opts.logMissingFile?.(`telegram.tokenFile read failed: ${String(err)}`);
+      return { token: "", source: "none" };
+    }
+    return { token: "", source: "none" };
+  }
+
+  const configToken = cfg?.telegram?.botToken?.trim();
+  if (configToken) {
+    return { token: configToken, source: "config" };
+  }
+
+  return { token: "", source: "none" };
+}