Recovers and adapts the structural refactoring from overwritten
main merge (b6f89f9) to current dev reality.
Scope:
- Schema extraction into apps/api/src/schemas/
- Docker service split into services/docker/ package
- Instance lifecycle extraction from api/tool_instances.py
- Config profile service extraction from api/config_profiles.py
- Auth dependency refactor (get_current_user)
- Frontend reorganization into features/ dirs + kebab-case naming
Exclusions (already in dev): seeding, defaults, unique constraint,
SSH key mounting, terminal backend, tunnel regex, session auto-numbering.
