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/client.js

@@ -1,3 +1,25 @@
+import { EnvHttpProxyAgent, fetch as undiciFetch } from 'undici';
+function resolveProxyUrl() {
+    return (process.env.HTTPS_PROXY
+        || process.env.HTTP_PROXY
+        || process.env.https_proxy
+        || process.env.http_proxy
+        || undefined);
+}
+/**
+ * Node's global `fetch` ignores HTTP(S)_PROXY unless `NODE_USE_ENV_PROXY=1`.
+ * Undici's EnvHttpProxyAgent honors the env vars (and NO_PROXY).
+ */
+function createDefaultFetch() {
+    if (!resolveProxyUrl())
+        return globalThis.fetch;
+    const agent = new EnvHttpProxyAgent();
+    const proxied = ((input, init) => undiciFetch(input, {
+        ...init,
+        dispatcher: agent,
+    }));
+    return proxied;
+}
 export class TelegramClient {
     token;
     fetchImpl;
@@ -8,7 +30,7 @@ export class TelegramClient {
             throw new Error('bot token is required');
         }
         this.token = token;
-        this.fetchImpl = options.fetch ?? fetch;
+        this.fetchImpl = options.fetch ?? createDefaultFetch();
         this.baseUrl = options.baseUrl ?? 'https://api.telegram.org';
         this.pollingTimeoutSec = options.pollingTimeoutSec ?? 30;
     }
@@ -69,4 +91,7 @@ export class TelegramClient {
             body.text = text;
         return this.call('answerCallbackQuery', body);
     }
+    async setMyCommands(commands) {
+        return this.call('setMyCommands', { commands });
+    }
 }