Add Launchplane runtime health addon

[cbusillo]

Summary

• add image-owned /opt/launchplane/addons root with launchplane_runtime_health
• expose /launchplane/health as a DB-independent runtime identity endpoint
• normalize server-mode Odoo starts so Launchplane addons and server-wide modules are preserved
• extend image smoke to exercise the new endpoint with a parsed runtime identity

Validation

• docker build -t odoo-docker-runtime-health:test --target runtime .
• bash scripts/smoke-runtime.sh odoo-docker-runtime-health:test
• bash scripts/smoke-db-init.sh odoo-docker-runtime-health:test
• bash scripts/test-odoo-bin-wrapper.sh
• shellcheck scripts/odoo-bin-wrapper.sh scripts/test-odoo-bin-wrapper.sh scripts/smoke-runtime.sh scripts/smoke-db-init.sh scripts/configure-dev-addon-paths.sh
• python3 -m py_compile launchplane/addons/launchplane_runtime_health/controllers/main.py launchplane/addons/launchplane_runtime_health/manifest.py

Rollout note

Merge and publish this image before merging the Launchplane probe-default PR that switches Odoo runtime identity evidence to /launchplane/health.