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/_components/channel-modal.tsx

@@ -0,0 +1,44 @@
+"use client";
+
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { ChannelForm } from "./channel-form";
+import type { ChannelRow } from "@/lib/telegram/admin-queries";
+
+interface ChannelModalProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  channel?: ChannelRow;
+}
+
+export function ChannelModal({
+  open,
+  onOpenChange,
+  channel,
+}: ChannelModalProps) {
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="sm:max-w-md">
+        <DialogHeader>
+          <DialogTitle>
+            {channel ? "Edit Channel" : "Add Channel"}
+          </DialogTitle>
+          <DialogDescription>
+            {channel
+              ? "Update the channel details below."
+              : "Add a Telegram channel. Source channels are scanned for archives, destination channels receive indexed files."}
+          </DialogDescription>
+        </DialogHeader>
+        <ChannelForm
+          channel={channel}
+          onSuccess={() => onOpenChange(false)}
+        />
+      </DialogContent>
+    </Dialog>
+  );
+}