Removed redundant `jvmToolchain(25)` declarations across module build scripts, as the JVM toolchain is now managed centrally. Added comments for clarity.
* chore(MP-21): snapshot pre-refactor state (Epic 1) * chore(MP-22): scaffold new repo structure, relocate Docker Compose, move frontend/backend modules, update Makefile; add docs mapping and env template * MP-22 Epic 2: Erfolgreich umgesetzt und verifiziert * MP-23 Epic 3: Gradle/Build Governance zentralisieren