feat: add Telegram integration with forum topic support and creator tracking

Adds full Telegram ZIP ingestion pipeline: TDLib worker service scans source
channels for archive files, deduplicates by content hash, extracts metadata,
uploads to archive channel, and indexes in Postgres. Forum supergroups are
scanned per-topic with topic names used as creator. Filename-based creator
extraction (e.g. "Mammoth Factory - 2026-01.zip") serves as fallback.

Includes admin UI for managing accounts/channels, simplified account setup
(API credentials via env vars), auth code/password submission dialog,
package browser with creator column, and live ingestion activity tracking.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/(app)/telegram/page.tsx

@@ -0,0 +1,17 @@
+import { auth } from "@/lib/auth";
+import { redirect } from "next/navigation";
+import { listAccounts, listChannels } from "@/lib/telegram/admin-queries";
+import { TelegramAdmin } from "./_components/telegram-admin";
+
+export default async function TelegramPage() {
+  const session = await auth();
+  if (!session?.user?.id) redirect("/login");
+  if (session.user.role !== "ADMIN") redirect("/dashboard");
+
+  const [accounts, channels] = await Promise.all([
+    listAccounts(),
+    listChannels(),
+  ]);
+
+  return <TelegramAdmin accounts={accounts} channels={channels} />;
+}