fix: ship prebuilt lib and drop prepare for one-click git install

Avoids pnpm allowBuilds block on dsh plugin add; README install steps expanded for first-time users.

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

lib/index.d.ts

@@ -0,0 +1,18 @@
+import type { Context } from '@deepseek-ai/cordis';
+import Schema from '@deepseek-ai/schemastery';
+export declare const name = "dsh-telegram-channel";
+export declare const inject: string[];
+export interface TelegramChannelConfig {
+    token?: string;
+    allowedUserIds?: number[];
+    allowAllUsers?: boolean;
+    maxMessageLength?: number;
+    pollingTimeoutSec?: number;
+}
+export declare const Config: Schema<TelegramChannelConfig>;
+export declare function apply(ctx: Context, config: TelegramChannelConfig): void;
+export * from './format.js';
+export * from './client.js';
+export * from './auth.js';
+export * from './commands.js';
+export * from './bridge.js';