refactor: remove minimum required fields constructor from ApplicationInformationDto

[dfcoffin]

Summary

Removed the 4-parameter convenience constructor from ApplicationInformationDto that only accepted dataCustodianId, clientId, clientSecret, and clientName.

Changes

• Removed: 4-parameter constructor (lines 217-223)
• Retained:
  • Default no-arg constructor (required for JAXB)
  • Canonical constructor with all 37 fields (auto-generated by Java record)
• Updated: Javadoc for default constructor to clarify canonical constructor availability

Rationale

• Simplifies the DTO by reducing constructor options
• The minimum required fields constructor was not used anywhere in the codebase
• Encourages use of the canonical constructor to ensure all required fields are properly set
• Prevents partial initialization that could lead to incomplete data

Testing

• ✅ All 18 integration tests passing:
  • H2: 6 tests
  • MySQL: 6 tests
  • PostgreSQL: 6 tests
• ✅ Build verified successful with no errors
• ✅ No breaking changes - constructor was unused in codebase

Impact

• Breaking Change: No (constructor was not in use)
• API Change: Yes (removes a public constructor)
• Migration Required: No

Closes #40

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