[SAGE] Upgrade to Latest LTS Java (Java 25)

[devangm]

As a developer
I want to upgrade the SAGE application to Java 25 (latest LTS)
So that the system runs on a modern, supported, and more efficient Java runtime with security and performance improvements.

Acceptance Criteria

• The build configuration is updated to use Java 25.
• The project compiles and runs successfully using Java 25 JDK.
• Docker images use an appropriate base image.
• All automated tests pass using Java 25.
• Any deprecated or removed Java APIs are updated as needed.