Fix OpenAPI and frontend port, add restart policy

[gavlyukovskiy]

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[Copilot]

Pull Request Overview

This PR fixes OpenAPI configuration behind a reverse proxy and updates Docker deployment settings. The changes make the OpenAPI suffix configurable and add restart policies to all Docker services.

Key changes:

• Made OpenAPI suffix configurable via properties/environment variables instead of hardcoding domain checks
• Added restart: on-failure policy to all Docker services for improved reliability
• Changed frontend nginx to listen on port 3000 instead of port 80

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
frontend/nginx.conf	Changed nginx listen port from 80 to 3000
deployment/docker-compose.yaml	Added restart policies, service dependencies, increased JVM cache, and OpenAPI suffix environment variable
deployment/README.md	Added operations documentation for SSH access, Docker stats, and log checking
backend/src/main/resources/application.properties	Added OpenAPI suffix configuration and Swagger UI URL properties
backend/src/main/java/net/hackyourfuture/coursehub/SwaggerBehindReverseProxyConfig.java	Replaced hardcoded domain check with configurable OpenAPI suffix
backend/src/main/java/net/hackyourfuture/coursehub/CourseHubApplication.java	Added ConfigurationPropertiesScan import (unused in shown diff)

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