chore: migrate to Spring Boot 4 and Spring AI 2

[vitorhugo-dotnet]

Summary

• Upgrade to Spring Boot 4.1.1 and Spring AI 2.0.1, refreshing compatible backend dependencies.
• Migrate Jackson, Spring Security, authorization server, and MCP integrations to their current APIs.
• Preserve OAuth behavior and backward compatibility for omitted Google Drive resume template values.
• Update setup guidance and migration notes.

Closes #83

Verification

• mvn -q verify — passed (433 tests)
• mvn -q dependency:tree — passed
• git diff --check — passed

Verification ran with Java 25; Java 21 runtime verification was not available in this environment.

[github-actions]

Qodana for JVM

13 new problems were found

Inspection name	Severity	Problems
Nullability and data flow problems	🔶 Warning	7
Constant values	🔶 Warning	4
Mismatched query and update of 'StringBuilder'	🔶 Warning	1
Simplifiable conditional expression	🔶 Warning	1

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