Integrate group files: nullable room for uploads, archive class, claim idempotency, upload route

Wires the three parallel group-cloud tracks to one surface and fixes the
seams between them:

- chat_media_archive.room_id becomes nullable (direct web uploads have no
  Matrix room yet — the contract's null-event pattern extends to the room);
  core GroupFile.roomId and ArchiveEntryInput.roomId follow.
- mime_class gains 'archive' (zip) across the 029 CHECK, validation
  MIME_CLASSES and the bot classifier — one vocabulary everywhere.
- registerArchiveEntry claim keys are null-safe for room-less uploads.
- New: POST /files/groups/:groupId/upload — FileInterceptor (20 MiB) streams
  through magic-byte sniffing, library-safe naming, oCIS upload and the
  metadata index, behind group-membership ACL (Owner/Admin bypass).
- safeFileName/sniffMime promoted to packages/core (file-names.ts,
  file-mime.ts) so the bot and the api share one implementation; the bot's
  local modules become re-export shims; @types/node added to core.

Verified: api typecheck clean, group-files 22/22, bot 74/74, web typecheck
clean; 029 re-applied clean on a fresh scratch DB (room_id nullable,
archive class, claim_key unique all confirmed in the catalog).

packages/core/package.json

@@ -11,6 +11,7 @@
     "typecheck": "tsc -p tsconfig.json --noEmit"
   },
   "devDependencies": {
+    "@types/node": "^26.6.5",
     "typescript": "^5.5.4",
     "vitest": "^2.0.5"
   }