Discover Maven and JDK 25 when they are not on PATH

[AMDphreak]

Summary

Hi! On Windows, a PATH-only Maven lookup fails even when Maven is installed. This repo does not ship mvnw, and a packaged JDK 24 (Adoptium, for example) is often on PATH while the project wants JDK 25.

This PR tries to make scripts/afx-run.ps1 and scripts/afx-run.sh find tools for this project:

• Wrapper in the repo (mvnw / mvnw.cmd), if someone adds one later
• Project pins: mise which mvn when mise.toml exists and mise is installed; sdkman candidates when .sdkmanrc exists
• Optional workstation tools hive (CODE_ROOT / C:\code / Z:\code → tools/apache-maven-* and tools/jdk-25)
• mvn on PATH last
• Print Using: ... (and JAVA_HOME) so the next failure is obvious

Hive paths are a fallback, not a hard dependency. The scripts do not download Maven and do not add a wrapper binary tree.

Happy to adjust anything that doesn't fit the project's taste.

Fixes #694

How to try it

1. Leave Maven off PATH (Get-Command mvn empty) and, if you have one, put Maven under tools/apache-maven-3.9.6 of your code hive — or rely on mise / sdkman / PATH.
2. Run .\scripts\afx-run.ps1 or ./scripts/afx-run.sh.
3. Confirm the first lines name the Maven binary and JDK 25 home you expected, then Ctrl+C before spring-boot:run finishes if you only wanted the lookup.

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