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/app/(app)/stls/_components/package-columns.tsx

@@ -12,7 +12,7 @@ export interface PackageRow {
   fileName: string;
   fileSize: string;
   contentHash: string;
-  archiveType: "ZIP" | "RAR";
+  archiveType: "ZIP" | "RAR" | "SEVEN_Z" | "DOCUMENT";
   fileCount: number;
   isMultipart: boolean;
   hasPreview: boolean;