feat(ui): add per-launch virtualenv find-links

[m199369309]

Summary

• add a repeatable Local Wheel Directories field to the model launch runtime-environment form
• serialize virtual_env_find_links into launch requests and restore it into form state
• include the field in launch parameter filtering
• generate repeated --virtual-env-find-link CLI arguments and parse them back from launch commands
• add English, Chinese, Japanese, and Korean labels

Dependency

Depends on #5387, which adds the secure backend, client, and CLI support for per-launch find-links.

This PR is intentionally stacked on #5387 (and transitively #5386). Shared commits will disappear from this PR after the dependencies are merged.

Validation

• npx prettier --check on all modified frontend files
• npx eslint . (passed with 56 pre-existing warnings and no errors)
• npm run build
• pre-commit run --files <modified files>

[gemini-code-assist]

Warning

You have reached your daily quota limit. Please wait up to 24 hours and I will start processing your requests again!