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.

backend/.env.example

@@ -20,6 +20,8 @@ POSTGRES_USER=dockerDBuser
 POSTGRES_PASSWORD=AWSJeMocDrahaZalezitost
 
 # ------------------ MEDIA / STATIC ------------------
+# USE_S3=True enables S3-compatible storage (MinIO or AWS).
+# Leave USE_S3=False (default) to use local filesystem in development.
 MEDIA_URL=/media/
 
 # ------------------ REDIS / CACHING / CHANNELS ------------------
@@ -44,12 +46,29 @@ EMAIL_USER=
 EMAIL_USER_PASSWORD=
 DEFAULT_FROM_EMAIL=
 
-# ------------------ AWS (disabled unless USE_AWS=True) ------------------
-USE_AWS=False
-AWS_ACCESS_KEY_ID=
-AWS_SECRET_ACCESS_KEY=
-AWS_STORAGE_BUCKET_NAME=
-AWS_S3_REGION_NAME=eu-central-1
+# ------------------ S3 STORAGE ------------------
+# Set USE_S3=True to enable. AWS_S3_ENDPOINT_URL selects the backend:
+#   set  → MinIO / S3-compatible
+#   empty → real AWS S3
+
+USE_S3=False
+
+# RustFS (docker-compose default — S3-compatible MinIO successor)
+AWS_S3_ENDPOINT_URL=http://rustfs:9000
+AWS_S3_CUSTOM_DOMAIN=localhost:9000/vontor
+AWS_STORAGE_BUCKET_NAME=vontor
+AWS_ACCESS_KEY_ID=rustfsadmin
+AWS_SECRET_ACCESS_KEY=rustfsadmin
+RUSTFS_ACCESS_KEY=rustfsadmin
+RUSTFS_SECRET_KEY=rustfsadmin
+RUSTFS_BUCKET_NAME=vontor
+
+# AWS S3 (swap in for production — clear AWS_S3_ENDPOINT_URL)
+# AWS_STORAGE_BUCKET_NAME=my-bucket
+# AWS_ACCESS_KEY_ID=
+# AWS_SECRET_ACCESS_KEY=
+# AWS_S3_REGION_NAME=eu-central-1
+# AWS_S3_ENDPOINT_URL=
 
 # ------------------ JWT / TOKENS (lifetimes defined in code) ------------------
 # (No env vars needed; kept placeholder section)