Security audit and vulnerability remediation

[megadotnet]

Addresses the request to conduct a comprehensive security audit of the project, including asset listing, SAST/SCA scanning, vulnerability classification, and generating a final security report (SECURITY_REPORT.md).

The following remediations have been implemented:

• Dependency Updates: Upgraded outdated and vulnerable dependencies mysql-connector-java, gson, and commons-lang3 to secure versions. Bumbed lombok version and java target to 21.
• SAST Code Fixes:
  • Addressed DM_DEFAULT_ENCODING by specifying StandardCharsets.UTF_8 when initializing Scanner in OSSFactory.
  • Addressed REFLC_REFLECTION_MAY_INCREASE_ACCESSIBILITY_OF_CLASS by using clazz.getDeclaredConstructor().newInstance() instead of clazz.newInstance() in OSSFactory.
  • Removed disps dead local store (DLS_DEAD_LOCAL_STORE) in WebConfigurer.
  • Fixed potential null pointer dereference (NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE) in WebConfigurer.corsFilter() without opening CORS permissiveness.
• Suppressed False Positives: Configured spotbugs-exclude.xml to ignore valid framework behaviors (like stateless API intentionally disabling CSRF, and DI-injected EI_EXPOSE_REP / JPA collection wrappers) that were throwing warnings but are actually safe/necessary.
• Testing: All tests pass successfully and SpotBugs completes cleanly with zero issues.

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PR created automatically by Jules for task 12956450566003466902 started by @megadotnet

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