feat: export Markdown notes (ARQ/Redis) + backup/restore BDD — v0.5.2

- Volume data/ (bind mount ./data) remplace le volume uploads nommé
  data/notes/ → .md auto-générés, data/uploads/ → médias, data/backup/ → dumps
- Service Redis (redis:7-alpine) + worker ARQ (backend-worker)
- notes_markdown.py : frontmatter YAML + contenu + pièces jointes (liens relatifs)
  Nom : YYYY-MM-DD_slug-titre_shortid.md, rotation si titre modifié
- api/notes.py : publie export_note_markdown / remove_note_markdown sur Redis
  après chaque create / update / delete / add_attachment / delete_attachment
- api/admin.py : POST /backup, GET /backups, POST /restore/{filename} (pg_dump/pg_restore)
- Backend Dockerfile : postgresql-client ; requirements : arq==0.26.1
- ConfigPage : section "Base de données" avec sauvegarde + liste + restauration

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

docker-compose.yml

@@ -13,20 +13,51 @@ services:
       timeout: 5s
       retries: 10
 
+  redis:
+    image: redis:7-alpine
+    volumes:
+      - redis_data:/data
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
   backend:
     build: ./backend
     environment:
       DATABASE_URL: postgresql+asyncpg://homehub:homehub@db:5432/homehub
-      UPLOAD_DIR: /uploads
+      UPLOAD_DIR: /data/uploads
+      DATA_DIR: /data
+      REDIS_URL: redis://redis:6379
       CORS_ORIGINS: http://localhost:3001,http://localhost:3000
     volumes:
       - ./backend/app:/app/app
-      - uploads:/uploads
+      - ./data:/data
     ports:
       - "8000:8000"
     depends_on:
       db:
         condition: service_healthy
+      redis:
+        condition: service_healthy
+
+  backend-worker:
+    build: ./backend
+    command: arq app.workers.notes_worker.WorkerSettings
+    environment:
+      DATABASE_URL: postgresql+asyncpg://homehub:homehub@db:5432/homehub
+      UPLOAD_DIR: /data/uploads
+      DATA_DIR: /data
+      REDIS_URL: redis://redis:6379
+    volumes:
+      - ./backend/app:/app/app
+      - ./data:/data
+    depends_on:
+      db:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
 
   frontend:
     build: ./frontend
@@ -37,4 +68,4 @@ services:
 
 volumes:
   db_data:
-  uploads:
+  redis_data: