feat(dataroom): bilingual descriptions, drag-drop multi-file upload, edit existing upload descriptions

- lib/translate.ts: LiteLLM DE<>EN translation utility
- Migration 006: description_de/description_en on both dataroom tables
- Admin + investor upload APIs: accept description+lang, auto-translate the other language on save
- PATCH /api/admin/dataroom/documents/[id]: description path in addition to display_name path
- PATCH /api/dataroom/uploads/[id]: investor can edit their own upload descriptions
- PATCH /api/admin/dataroom/investors/[id]/uploads: admin can edit investor upload descriptions
- All GET queries updated to return description fields
- Admin dataroom: drop zone replaces upload button, multi-file, inline description editor per doc and per investor upload
- Investor dataroom: drop zone, multi-file, description+lang textarea before upload, inline description editing on existing uploads

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pitch-deck/app/api/admin/migrate/route.ts

@@ -155,6 +155,11 @@ export async function POST(request: NextRequest) {
     `CREATE INDEX IF NOT EXISTS idx_dataroom_releases_investor ON dataroom_releases(investor_id)`,
     `CREATE INDEX IF NOT EXISTS idx_dataroom_releases_document ON dataroom_releases(document_id)`,
     `CREATE INDEX IF NOT EXISTS idx_dataroom_uploads_investor ON dataroom_investor_uploads(investor_id)`,
+    // 006 — dataroom bilingual descriptions
+    `ALTER TABLE dataroom_documents ADD COLUMN IF NOT EXISTS description_de TEXT`,
+    `ALTER TABLE dataroom_documents ADD COLUMN IF NOT EXISTS description_en TEXT`,
+    `ALTER TABLE dataroom_investor_uploads ADD COLUMN IF NOT EXISTS description_de TEXT`,
+    `ALTER TABLE dataroom_investor_uploads ADD COLUMN IF NOT EXISTS description_en TEXT`,
   ]
 
   for (const sql of statements) {