Phase 6: PDF & Polish — PDF generation, admin users/settings, AI tool

Backend:
- Setting + GeneratedPdf models, Alembic migration with default settings seed
- PDF generation service (WeasyPrint + Jinja2 with autoescape)
- Health report HTML template with memory entries + document excerpts
- Admin user management: list, create, update (role/max_chats/is_active)
- Admin settings: self_registration_enabled, default_max_chats
- Self-registration check wired into auth register endpoint
- default_max_chats applied to new user registrations
- AI tool: generate_pdf creates health compilation PDFs
- PDF compile/list/download API endpoints
- WeasyPrint system deps added to Dockerfile

Frontend:
- PDF reports page with generate + download
- Admin users page with create/edit/activate/deactivate
- Admin settings page with self-registration toggle + max chats
- Extended sidebar with PDF reports + admin users/settings links
- English + Russian translations for all new UI

Review fixes applied:
- Jinja2 autoescape enabled (XSS prevention in PDFs)
- db.refresh after flush (created_at populated correctly)
- storage_path removed from API response (no internal path leak)
- Role field uses Literal["user", "admin"] validation
- React hooks called before conditional returns (rules of hooks)
- default_max_chats setting now applied during registration

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

plans/phase-6-pdf-polish.md

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+# Phase 6: PDF & Polish — Subplan
+
+## Goal
+
+Deliver PDF health-compilation generation (WeasyPrint + AI tool), admin user management CRUD, admin app settings with self-registration toggle, and generated_pdfs tracking.
+
+## Prerequisites
+
+- Phase 5 completed (notifications, scheduler, all AI tools except generate_pdf)
+
+---
+
+## Tasks
+
+### A. Backend Models & Migration (Tasks 1–3)
+
+- [x] **A1.** Create `backend/app/models/setting.py`: Setting model (key PK, value JSONB, updated_by, updated_at).
+- [x] **A2.** Create `backend/app/models/generated_pdf.py`: GeneratedPdf model (user_id, title, storage_path, source_document_ids, source_chat_id).
+- [x] **A3.** Create migration `006`. Seed default settings. Update `models/__init__.py` + User relationships.
+
+### B. Backend Schemas (Tasks 4–5)
+
+- [x] **B4.** Create `backend/app/schemas/setting.py` and `backend/app/schemas/pdf.py`.
+- [x] **B5.** Create `backend/app/schemas/admin.py` (AdminUserResponse, AdminUserCreateRequest, AdminUserUpdateRequest).
+
+### C. Backend Services (Tasks 6–10)
+
+- [x] **C6.** Add `weasyprint`, `jinja2` to pyproject.toml. Update Dockerfile for WeasyPrint deps.
+- [x] **C7.** Create `backend/app/services/pdf_service.py` + HTML template.
+- [x] **C8.** Create `backend/app/services/setting_service.py`.
+- [x] **C9.** Create `backend/app/services/admin_user_service.py`.
+- [x] **C10.** Wire `self_registration_enabled` check into auth register endpoint.
+
+### D. Backend API (Tasks 11–13)
+
+- [x] **D11.** Create `backend/app/api/v1/pdf.py`: compile, list, download. Register in router.
+- [x] **D12.** Extend `backend/app/api/v1/admin.py`: users CRUD + settings endpoints.
+- [x] **D13.** Add `generate_pdf` AI tool to ai_service.py.
+
+### E. Frontend (Tasks 14–19)
+
+- [x] **E14.** Create `frontend/src/api/pdf.ts`. Extend `admin.ts` with user/settings functions.
+- [x] **E15.** Create `frontend/src/pages/admin/users.tsx`.
+- [x] **E16.** Create `frontend/src/pages/admin/settings.tsx`.
+- [x] **E17.** Create `frontend/src/pages/pdf.tsx`.
+- [x] **E18.** Update routes + sidebar (PDF nav, admin users/settings).
+- [x] **E19.** Update en/ru translations.
+
+### F. Tests & Verification (Tasks 20–21)
+
+- [x] **F20.** Create backend tests: test_pdf.py, test_admin_users.py, test_settings.py.
+- [x] **F21.** Verify frontend builds cleanly.
+
+---
+
+## Acceptance Criteria
+
+1. PDF compilation generates downloadable PDF from documents + memory
+2. AI tool `generate_pdf` works in chat
+3. Admin can CRUD users (role, max_chats, is_active)
+4. Admin can manage app settings (self_registration_enabled, default_max_chats)
+5. Registration respects self_registration_enabled setting
+6. Frontend admin pages + PDF page functional
+7. All UI text in English and Russian
+8. Backend tests pass, frontend builds clean
+
+---
+
+## Status
+
+**COMPLETED**