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- Add documentation: Backend Architecture, Sequence diagram, Deployment diagram - Add root .gitignore for Java, Node, Docker and IDE artifacts - Scaffold Spring Boot 3.2 backend via Spring Initializr - Verify empty app starts on port 8080
- ShortenedUrl entity with alias as natural PK, fullUrl, createdAt - ShortenedUrlRepository extends JpaRepository<ShortenedUrl, String> - application.yml: H2 file datasource default, Postgres via env vars - Hibernate ddl-auto: update for schema bootstrapping
- UrlShortenerExceptions: AliasNotFoundException, AliasAlreadyTakenException - InvalidUrlException, InvalidAliasException as static inner classes - Keeps service layer free of exception definitions
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feat: define domain exception hierarchy