* OpenRouter: new OpenAI-compatible provider with chat + embedding model
routing, health check via /models, and a fetchOpenRouterModels() helper
for the settings UI. API key, base URL and model fields are persisted in
AISettings, surfaced in AIPanel, indexed by commandRegistry, and added
to backupService's credential allow-list so the key round-trips through
encrypted backups.
* utils/httpFetch: introduce getAIFetch() as the single decision point for
outbound AI traffic. In Tauri it returns @tauri-apps/plugin-http's fetch
(Rust/reqwest transport, no renderer CORS preflight, no Android cleartext
block); on the web build it falls back to window.fetch. OllamaProvider
is migrated end-to-end — both ai-sdk-ollama streaming and the /api/tags
health probe — and the new OpenRouterProvider uses the same path, so any
future provider only has to call getAIFetch().
* Tests: unit tests for OpenRouter provider behavior (model selection,
availability, health check) and a backup-settings round-trip test
ensuring openrouterApiKey is treated as a credential field.
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