Adds `anthropic_api` model type so users can authenticate with a direct
Anthropic API key instead of (or alongside) the CLI OAuth session.
- model_registry.py: `anthropic_api` type; `save/get/remove_anthropic_api_key()`
mirroring the Google account pattern; `save_cloud_model()` now picks type
based on credential type (cli → claude_cli, api_key → anthropic_api);
`_resolve_model()` merges api_key from the credential entry
- llm_client.py: `_anthropic_api()` backend (AsyncAnthropic SDK); dispatch
and fallback wiring; usage tracking
- routers/local_llm.py: Anthropic API key management routes
(POST /settings/local/anthropic-key, /anthropic-key/{id}/remove);
`anthropic_api` badge and edit-form credential selector
- static/local_llm.html: Anthropic Cloud Provider block now shows API key
management (add/remove); Add Model → Anthropic tab has credential selector
(CLI vs API key)
- requirements.txt: enable anthropic>=0.40.0
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>