feat: add support for 7z, PDF, STL, and other document types

- Add 7Z and DOCUMENT to ArchiveType enum
- Detect .7z, .pdf, .stl, .obj, .3mf, .step, .blend, .gcode, .svg,
  .dxf, .ai, .eps, .psd files as fetchable documents
- Handle DOCUMENT and 7Z formats in worker pipeline (skip extraction,
  record file as single entry)
- Add Prisma migration for new enum values

prisma/migrations/20260321180000_add_archive_types/migration.sql

@@ -0,0 +1,3 @@
+-- AlterEnum
+ALTER TYPE "ArchiveType" ADD VALUE 'SEVEN_Z';
+ALTER TYPE "ArchiveType" ADD VALUE 'DOCUMENT';

prisma/schema.prisma

@@ -377,6 +377,8 @@ enum ChannelRole {
 enum ArchiveType {
   ZIP
   RAR
+  SEVEN_Z
+  DOCUMENT
 }
 
 enum IngestionStatus {