Simplify install with one-click scripts; honor HTTP(S)_PROXY for Telegram.

Add install.ps1/install.sh, shrink README to script-first flow, register bot commands, and route API calls through undici EnvHttpProxyAgent when a proxy is set (v0.2.2).

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/bridge.js

@@ -51,9 +51,21 @@ export class TelegramBridge {
                 this.ctx.logger.error(this.redact(err));
             });
         });
+        void this.client.setMyCommands([
+            { command: 'start', description: '欢迎与用法' },
+            { command: 'sessions', description: '列出并附着本机 live 会话' },
+            { command: 'status', description: '查看当前绑定' },
+            { command: 'unbind', description: '断开手机绑定（不关闭本机会话）' },
+            { command: 'help', description: '显示帮助' },
+        ]).then(() => {
+            this.ctx.logger.info('dsh-telegram-channel: bot commands registered');
+        }).catch((err) => {
+            this.ctx.logger.warn(`dsh-telegram-channel: setMyCommands failed: ${this.redact(err)}`);
+        });
         if (!this.polling) {
             this.polling = true;
             this.pollAbort = new AbortController();
+            this.ctx.logger.info('dsh-telegram-channel: long-polling started');
             this.pollPromise = this.pollLoop();
         }
     }