Add Jev browser CLI mode with saved OpenRouter settings

[Anton-Horn]

Adds cate browser jev "<prompt>" to control the selected browser tab using TypeSafe Jev through OpenRouter. Users save their key in Settings → CLI → OpenRouter API key; Cate makes provider requests in the main process, so local and remote terminal commands do not need an exported OpenRouter key.

Jev chooses browser actions, observed targets, explicit destination URLs, and one whitespace-separated prompt word for each field value. Runs support panel overrides, step limits, and JSON results, and stop on uncertainty or user takeover. Field validation tolerates unrelated page updates while preventing writes after the document or target changes. Large page observations are bounded before inference.

Updates both bundled and installed cate-cli skills. The key uses Cate's existing settings persistence and a masked input; clearing it disables provider requests. Browser Read and Control permissions gate inference. Multiword field values and novel text generation are not supported.

Validation:

• Type checking and production build passed on the isolated PR branch.
• 144 focused tests passed for CLI behavior, provider requests, settings persistence, permissions, browser routing, and user takeover.
• Two deterministic Electron tests passed on the PR build through the settings UI, actual CLI, and browser, including clearing the key.
• Three live OpenRouter workflows passed through the real CLI with an empty terminal OPENROUTER_API_KEY: save Hi, save Hello!, and search Wikipedia for Berlin.
• Focused ESLint passed apart from an existing prefer-const finding on the unchanged timer declaration in cateApiHandlers.ts:85.