Move process wiring, technical adapters, and cross-cutting contracts out of flat internal/ packages so new code has a clear home without changing business layout.
- Updated AGENTS.md, new-api SKILL.md, and new-async-task SKILL.md to remove references to the deleted global internal/service/ package.
- Documented feature-based local logics/services design within internal/apps/<module>/.
- Updated package comments in internal/diskcache to point to pkg/cache/disk.
ryan