Migrate product profile reads to FastAPI

[cbusillo]

Summary

• add native FastAPI product-profile list/show read contracts
• preserve collection-only Every Code worker token access while keeping show behind normal identity/authz
• delete the retired legacy WSGI product-profile read branches and update v2 compatibility docs

Validation

• uv run python -m unittest tests.test_http_app.FastApiProductProfileReadTests
• uv run --extra dev ruff format --check control_plane/http_app.py control_plane/service.py control_plane/service_auth.py tests/test_http_app.py tests/test_service.py
• uv run --extra dev ruff check --diff .
• uv run --extra dev mypy control_plane tests
• uv run --extra dev ruff check .
• uv run python -m unittest
• uv run /Users/cbusillo/Developer/codex-skills/jetbrains-inspection/scripts/jb-inspect.py closeout --repo "/Users/cbusillo/Developer/launchplane" --scope changed_files

Refs #1322