Add S3/MinIO (RustFS) support and compose updates

Introduce S3-compatible storage support and update local/dev configuration.

- .claude: add "WebSearch" to local settings
- backend/.env.example: add USE_S3 flag and detailed S3/MinIO (RustFS) example env vars + comments to explain dev vs production usage
- backend/vontor_cz/settings.py: refactor to use USE_S3 boolean; set STATIC_ROOT; configure STORAGES for local filesystem vs S3 backends; add handling for S3 endpoint (MinIO/RustFS) vs real AWS S3 including path-style addressing, URL construction, and sensible AWS defaults
- docker-compose.yml: add rustfs to service dependencies, include rustfs in networks, change frontend port mapping to 8001:80, and add rustfs-data volume binding

These changes enable using a local S3-compatible backend (RustFS/MinIO) in development while keeping the option to swap to real AWS S3 for production.

docker-compose.yml

@@ -12,6 +12,7 @@ services:
     depends_on:
       - db
       - redis
+      - rustfs
     volumes:
       - ./backend:/app
       - static-data:/app/collectedstaticfiles
@@ -66,6 +67,7 @@ services:
       - redis
       - db
       - backend
+      - rustfs
     networks:
       - app_network
 
@@ -84,6 +86,7 @@ services:
       - redis
       - db
       - backend
+      - rustfs
     networks:
       - app_network
 
@@ -114,8 +117,7 @@ services:
     env_file:
       - ./frontend/.env
     ports:
-     - 80:80
-      # - 9000:80
+     - 8001:80
     depends_on:
       - backend
     networks:
@@ -157,4 +159,10 @@ volumes:
       type: none
       o: bind
       device: ./volumes/media
+  rustfs-data:
+    driver: local
+    driver_opts:
+      type: none
+      o: bind
+      device: ./volumes/rustfs