Build shared apply engine for app releases

[kacy]

Summary

• add a shared apply executor and apply report model used by local and cluster app deploys
• wire app status/history/rollback reads and responses through shared release transition metadata
• add persisted-read and real route-flow tests for rollback and failed apply release behavior

Validation

• YOQ_SKIP_SLOW_TESTS=1 zig build test -Doptimize=ReleaseSafe -Dtest-filter='app apply then rollback routes preserve release transition metadata'
• YOQ_SKIP_SLOW_TESTS=1 zig build test -Doptimize=ReleaseSafe -Dtest-filter='app apply route preserves failed release metadata across reads'
• YOQ_SKIP_SLOW_TESTS=1 zig build test -Doptimize=ReleaseSafe -Dtest-filter='app status and history surface rollback release metadata from persisted rows'
• YOQ_SKIP_SLOW_TESTS=1 zig build test -Doptimize=ReleaseSafe -Dtest-filter='app status and history surface failed apply metadata from persisted rows'