Improve static typing of ModCDP config parameter shapes

[pirate]

Summary

• add missing JS config schema fields for launcher and upstream options
• add flat Python TypedDicts for launcher/upstream/injector/client config shapes
• type the Python client constructor against those config shapes while preserving generic mapping inputs

Validation

• pnpm exec tsc -p tsconfig.json --noEmit
• uv --directory python run pyright
• uv run python -m py_compile python/modcdp/types/modcdp.py python/modcdp/client/ModCDPClient.py
• pnpm exec vitest run js/test/test.ModCDPClient.ts -t "normalizes nested config owners|defaults service worker suffix" --fileParallelism=false --maxWorkers=1
• uv --directory python run python -m unittest tests.test_ModCDPClient.ModCDPClientTests.test_constructor_normalizes_nested_config_owners tests.test_ModCDPClient.ModCDPClientTests.test_preserves_explicit_zero_timeout_config tests.test_ModCDPClient.ModCDPClientTests.test_defaults_service_worker_suffix_config_to_modcdp_worker