feat: add channel categories and improved creator detection

- Add category field to TelegramChannel (filterable tag like STL, PDF, D&D)
- Category column in channels table with edit via dropdown menu
- Improved creator extraction: filename patterns + channel title fallback
- extractCreatorFromChannelTitle strips [Completed], (Paid), emoji, etc.
- Fix ArchiveType in PackageListItem and PackageRow for new types
- Add Prisma migration for category column

src/lib/telegram/admin-queries.ts

@@ -42,6 +42,7 @@ export async function listChannels() {
     title: c.title,
     type: c.type,
     isActive: c.isActive,
+    category: c.category,
     createdAt: c.createdAt.toISOString(),
     accountCount: c._count.accountMaps,
     packageCount: c._count.packages,