Update Dockerfile and docker-compose for config.json and Mailpit integration

Dockerfile

@@ -29,6 +29,7 @@ WORKDIR /app
 
 COPY --from=builder /app/build/visione-backend     /app/visione-backend
 COPY --from=builder /app/build/openapi             /app/build/openapi
+COPY --from=builder /app/config.json               /app/config.json
 COPY --from=builder /app/migrations                /app/migrations
 
 EXPOSE 5555

README.md

@@ -134,13 +134,13 @@ client address.
 ## Dokploy
 
 Use `docker-compose.dev.yml` as the Dokploy compose path for a self-contained
-backend deployment with MySQL and MailHog. Configure the public domain in
-Dokploy against service `backend` and container port `5555`.
+backend deployment with MySQL and a local SMTP catcher. Configure the public
+domain in Dokploy against service `backend` and container port `5555`.
 
-Before deploying, create an Advanced Mount named `config.json` in Dokploy and
-paste the repository `config.json` content into it. The compose file mounts it
-from `../files/config.json` so AutoDeploy does not depend on bind mounts from a
-freshly cloned repository.
+The runtime image includes `config.json`; override environment-specific values
+with Dokploy environment variables. The SMTP catcher service keeps the internal
+name `mailhog` for compatibility, but uses the multi-architecture Mailpit image
+to avoid `exec format error` failures on ARM servers.
 
 Set `MYSQL_PASSWORD`, `MYSQL_ROOT_PASSWORD` and any other environment-specific
 values in Dokploy environment variables.

docker-compose.dev.yml

@@ -5,7 +5,6 @@ services:
       dockerfile: Dockerfile
     restart: unless-stopped
     volumes:
-      - ../files/config.json:/app/config.json:ro
       - uploads-data:/app/uploads
     environment:
       DB_HOST: ${DB_HOST:-mysql}
@@ -46,7 +45,7 @@ services:
       start_period: 20s
 
   mailhog:
-    image: mailhog/mailhog:v1.0.1
+    image: axllent/mailpit:latest
     restart: unless-stopped
     expose:
       - "1025"