Add Telegram and Discord IM channels

plugin-src/client/channels/discord/api.js

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+import { TOKEN_BOT_ENDPOINTS, createTokenChannelApi } from '../shared/token-api.js';
+
+export const DISCORD_RPC_CHANNEL = '/discord';
+export const DISCORD_ENDPOINTS = TOKEN_BOT_ENDPOINTS;
+
+const api = createTokenChannelApi('Discord', ' Gateway 长连接');
+
+export const unwrapRpcResult = api.unwrapRpcResult;
+export const normalizeSnapshot = api.normalizeSnapshot;
+export const presentError = api.presentError;
+export { api as discordClientApi };

plugin-src/client/channels/discord/index.js

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+import { DiscordLogoGlyph } from '../../channel-logos.js';
+import { createTokenChannelSettings } from '../shared/token-channel.js';
+import {
+  DISCORD_ENDPOINTS,
+  discordClientApi,
+} from './api.js';
+import { installDiscordStyles } from './styles.js';
+
+const channel = createTokenChannelSettings({
+  channel: 'Discord',
+  endpoints: DISCORD_ENDPOINTS,
+  api: discordClientApi,
+  LogoGlyph: DiscordLogoGlyph,
+  installStyles: installDiscordStyles,
+  pageClass: 'ddc-page',
+  avatarClass: 'ddc-avatar',
+  connectionLabel: 'Gateway 长连接',
+  tokenPlaceholder: '填写 Discord Developer Portal 的 Bot Token',
+  emptyTitle: '接入 Discord 机器人',
+  emptyDescription: '先在 Developer Portal 创建 Bot 并邀请到服务器，再在这里完成接入。',
+  platformLabel: 'Discord Developer Portal',
+});
+
+export const DiscordSettingsTab = channel.SettingsTab;
+export const DiscordAccountCard = channel.AccountCard;

plugin-src/client/channels/discord/styles.js

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+export const DISCORD_STYLE_ID = 'xmanrui-dsh-im-discord-settings';
+
+const CSS = String.raw`
+.ddc-page { --ddt-accent: #5865f2; --ddt-accent-deep: #4752c4; --ddt-accent-wash: #eef0ff; }
+.ddc-avatar { color: #fff; background: #5865f2; }
+.ddc-avatar svg { display: block; }
+`;
+
+export function installDiscordStyles() {
+  if (typeof document === 'undefined') return () => {};
+  const existing = document.querySelector(`style[data-plugin-css="${DISCORD_STYLE_ID}"]`);
+  if (existing) return () => {};
+  const style = document.createElement('style');
+  style.dataset.plugin = '@xmanrui/dsh-im';
+  style.dataset.pluginCss = DISCORD_STYLE_ID;
+  style.textContent = CSS;
+  document.head.appendChild(style);
+  return () => style.remove();
+}