EPIC 8 - INBOUND WEBHOOKS & CRM INBOX ✅
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Backend:
- Add is_read field to memos table with auto-migration
- Inbound webhook endpoint: POST /inbound_webhooks/{workspace_id}
- Inbox endpoints: GET /users/{id}/inbox/unread_count, GET /users/{id}/inbox/memos
- Webhook payload formatting (title+body → markdown, arbitrary → bullet list)
- Optional secret verification via X-Webhook-Secret header
- Database indexes: idx_memos_is_read, idx_memos_workspace

Frontend:
- Inboxes.tsx: Two tabs (Notifications + Unread Memos)
- useInboxUnreadCount hook with 60s refetch
- useMarkMemoAsRead mutation
- Navigation badge: notifications + unread memos count
- i18n: inbox.* keys (en/vi)

DOCUMENT MANAGEMENT (DOCX/PDF) 🆕
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Backend:
- New table: cuccu_documents with full schema
- DocumentService: upload, list, get, update, delete, process, import_to_memo
- AI enhancement via OpenAI (tag extraction + summarization)
- python-docx integration for text extraction
- Status workflow: PENDING → PROCESSING → COMPLETED/FAILED
- API routes: /documents/upload, /documents, /documents/{id}, /documents/{id}/process, /documents/{id}/import

Frontend:
- New page: DocumentsPage (route: /app/documents)
- Components: UploadArea, DocumentList, DocumentCard, PreviewPanel
- Hooks: useDocuments, useDocumentUpload, useDocumentProcess, useDocumentImport
- AI enhancement panel with toggles (extract tags, generate summary)
- Drag-and-drop file upload with validation
- Status badges, tag display, content preview
- Workspace isolation support
- Full i18n support (en/vi)

Files changed:
- Backend: 15+ files (new: api/documents/, common/sqlite_client.py updates, schemas, services, config)
- Frontend: 20+ files (new: components/Documents/, hooks/useDocuments.ts, docxService.ts, pages/DocumentsPage.tsx)
- Tests: test_inbox.py (5 tests passing)
- Plan docs: epic-8-inbound-webhooks-crm-inbox-done.md, docx-frontend-detailed-plan.md

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