feat: fix channel scanning bugs, add package tags, and kickstarters tab

Bug fixes:
- Fix channels not being scanned by paginating TDLib getChats (was only
  loading first batch, additional channels were unknown to TDLib)
- Add per-channel getChat pre-load as safety net before scanning
- Fix preview pictures not loading by checking previewData instead of
  previewMsgId for hasPreview flag
- Prevent previewMsgId from being set when preview download fails

Package Tags:
- Add tags Text[] column to Package with migration backfilling from
  channel categories
- Worker auto-inherits source channel category as initial tag
- Tag filter dropdown and Tags column in STL Files table
- Server actions for individual and bulk tag editing

Kickstarters Tab:
- New KickstarterHost, Kickstarter, and KickstarterPackage models
- Full CRUD with delivery status, payment status, host management
- Package linking (many-to-many with existing packages)
- Sidebar entry with Gift icon
- Table with search, filters, modal forms

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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

@@ -0,0 +1,29 @@
+import { auth } from "@/lib/auth";
+import { redirect } from "next/navigation";
+import { getKickstarters, getKickstarterHosts } from "@/data/kickstarter.queries";
+import type { DataTableSearchParams } from "@/types/table.types";
+import { KickstarterTable } from "./_components/kickstarter-table";
+
+interface Props {
+  searchParams: Promise<DataTableSearchParams & { delivery?: string; payment?: string; host?: string }>;
+}
+
+export default async function KickstartersPage({ searchParams }: Props) {
+  const session = await auth();
+  if (!session?.user?.id) redirect("/login");
+
+  const params = await searchParams;
+  const [{ data, pageCount, totalCount }, hosts] = await Promise.all([
+    getKickstarters(session.user.id, params),
+    getKickstarterHosts(),
+  ]);
+
+  return (
+    <KickstarterTable
+      data={data}
+      pageCount={pageCount}
+      totalCount={totalCount}
+      hosts={hosts}
+    />
+  );
+}