Add monorepo CI, test profile, H2 test DB and mock AI services for backend tests

[FencyJay]

Motivation

• Convert the repository to a monorepo CI layout so backend and frontend can be validated independently in CI.
• Make backend tests hermetic by providing a test Spring profile, an in-memory H2 datasource, and mocked AI services.
• Improve developer experience by documenting CI behavior in README.md.

Description

• Replace single Spring Boot Maven CI job with a multi-job GitHub Actions workflow named Monorepo CI that adds backend and frontend jobs, adds workflow_dispatch, and triggers on master and work branches in /.github/workflows/ci.yml.
• Configure backend job to run in coder-practice-backend with actions/checkout@v4, actions/setup-java@v4, Maven caching, and run mvn -B test -Dspring.profiles.active=test.
• Configure frontend job to run in coder-practice-frontend with actions/setup-node@v4, node/npm caching, and steps npm ci, npm run lint, and npm run build.
• Add application-test.yml to use an in-memory H2 DB and test OpenAI placeholder keys and empty Sentry DSN for tests in coder-practice-backend/src/test/resources/application-test.yml.
• Add MockAiServiceConfig test configuration to provide primary mocked beans for LevelGenerationService and ResultReportService under the test profile in coder-practice-backend/src/test/java/.../MockAiServiceConfig.java.
• Add H2 test dependency to coder-practice-backend/pom.xml and annotate backend tests with @ActiveProfiles("test") to pick up test config in multiple test classes, and relax some assertions that depend on external network responses.
• Update README.md with a CI section describing triggers and the commands executed by CI.

Testing

• The CI workflow is configured to run backend unit tests via mvn -B test -Dspring.profiles.active=test and frontend checks via npm ci, npm run lint, and npm run build as part of the GitHub Actions jobs.
• Backend unit tests were run under the test profile using the in-memory H2 DB and mocked AI services and succeeded.

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Project	Deployment	Actions	Updated (UTC)
code-practice-frontend	Ready	Preview, Comment	Mar 5, 2026 6:25am

[FencyJay]

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