Add provider-neutral deploy target evidence

[cbusillo]

Summary

• add provider-neutral deployed target evidence with provider id, target category, id, display name, and adapter evidence
• keep existing Dokploy-shaped resolved target fields readable and translate them into neutral target references
• add provider metadata to ship/deploy evidence while preserving existing defaults
• expose neutral deployed target metadata on lane summaries
• document the compatibility boundary and add fake-provider storage coverage

Closes #1045.

Verification

• uv run python -m unittest tests.test_filesystem_store tests.test_postgres_store
• uv run python -m unittest tests.test_generic_web_deploy tests.test_generic_web_promotion tests.test_promote tests.test_evidence_ingestion tests.test_public_ingress_monitor tests.test_product_environment_read_model
• uv run --extra dev ruff check --diff control_plane/contracts/deploy_target.py control_plane/contracts/deployment_record.py control_plane/contracts/promotion_record.py control_plane/contracts/ship_request.py control_plane/contracts/lane_summary.py tests/test_filesystem_store.py tests/test_postgres_store.py
• uv run --extra dev ruff check control_plane/contracts/deploy_target.py control_plane/contracts/deployment_record.py control_plane/contracts/promotion_record.py control_plane/contracts/ship_request.py control_plane/contracts/lane_summary.py tests/test_filesystem_store.py tests/test_postgres_store.py
• uv run --extra dev mypy control_plane/contracts/deploy_target.py control_plane/contracts/deployment_record.py control_plane/contracts/promotion_record.py control_plane/contracts/ship_request.py control_plane/contracts/lane_summary.py tests/test_filesystem_store.py tests/test_postgres_store.py
• uv run python -m unittest (1830 tests)