chore: resolve merge conflicts, keep Spring Boot 4.0.6 version

Kept our version over remote (security hardening PR #12) for all conflicts:
- pom.xml: Spring Boot 4.0.6 vs 3.4.1, new test deps
- SecurityConfig: new csrf/package API for SB4
- GlobalExceptionHandler: full handler set with SLF4J logging
- AppUserController/ExpenseListController: clean delegation to GlobalExceptionHandler
- Test files: SB4 package paths, extra test coverage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
2026-05-10 20:29:49 +02:00

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