C14 C16 C17 C18 C20 A11 A15 X10 X12 X15: dead Steam count code, GameNames, steamIdText, one query per game for the finished estimate, no API versioning config, open-in-view off, CORS from APP_FRONTEND_URL, non-root image, prune only up to the highest known id.
Add project bootstrap for build, CI/CD, and local development. Introduces Maven Wrapper (mvnw, mvnw.cmd, .mvn/wrapper), multi-stage Dockerfile, docker-compose files (compose.yaml, docker-compose.dev.yml), .env, banner and README. Adds Gitea Actions workflow to build, test and push container images. Update application.yml (port -> 8090, virtual threads, API versioning, management/actuator/prometheus settings, Steam API config) and add application-dev.yml for local overrides. Extend pom.xml with caching, observability (actuator, micrometer/prometheus), testing/dev dependencies (testcontainers, devtools, additional spring test modules) to support CI and local testing.