Refactor workflow service boundaries

[YunaBraska]

Summary

• stack the service-boundary refactor on top of Refactor workflow internals base #90 instead of conflicting with dev
• collapse the split client/entry/git/run/settings/state/syntax internals into fewer Workflow* service entry points
• keep the newer release/dependency docs and Gitea workflow icon behavior from the base layer

Why

This is the second layer of the refactor stack. #90 parks the accidental dev work cleanly; this PR keeps the useful older service-boundary idea without undoing the fresh base changes. The branch was backed up before rewriting. Paper trail intact, chaos contained.

Checks

• ./gradlew --no-daemon compileJava compileTestJava --warning-mode all
• ./gradlew --no-daemon test --warning-mode all
• ./gradlew --no-daemon check verifyPlugin buildPlugin --warning-mode all