feat(ai): self-host settings UI for Anthropic provider (5/5)

[gariasf]

Summary

Closes the 5-PR Anthropic series. PR 5 of 5, stacked on #1986.

Adds the Anthropic panel and the install-wide LLM provider selector to the self-hosting settings page, plus a shared data-handling disclosure that covers both OpenAI and Anthropic with parity.

What changed

Views

• _llm_provider_selector.html.erb — install-level select for Setting.llm_provider (`openai | anthropic`). Respects the `LLM_PROVIDER` env var (disables the control + shows the "configured through environment variables" hint, mirroring the OpenAI panel). Renders a compact "Data handling" block with one-sentence retention statements for each provider — surfaced once for both providers since the wording is the same.
• _anthropic_settings.html.erb — mirrors _openai_settings.html.erb field-for-field:
  • anthropic_access_token password field, ******** redaction when stored, disabled when `ANTHROPIC_ACCESS_TOKEN` / `ANTHROPIC_API_KEY` env is set.
  • anthropic_base_url text field (optional — for AWS Bedrock / GCP Vertex proxies).
  • anthropic_model text field (optional — defaults to `claude-sonnet-4-6`).
  • All three fields disable when their env var is set, so env-driven installs see the value is locked.
• show.html.erb — renders provider selector → OpenAI panel → Anthropic panel under the existing "General" section. No section restructure.

Controller (Settings::HostingsController)

• Permits anthropic_access_token, anthropic_base_url, anthropic_model, llm_provider in hosting_params.
• Persists each one, applying the same "********" placeholder protection that OpenAI uses so an unchanged form re-submit doesn't overwrite a stored key with the redacted display string.
• Validates llm_provider against %w[openai anthropic] — unknown values are dropped without raising.
• On Setting::ValidationError the rescue branch now also stashes @anthropic_base_url_input / @anthropic_model_input so the form re-renders with the user's typed values intact (parity with the OpenAI fix from issue Bug: OpenAI Custom URL field clears itself if Model is not filled first #1824).

Locales

• Adds settings.hostings.llm_provider_selector.* and settings.hostings.anthropic_settings.* keys to config/locales/views/settings/hostings/en.yml.

Visual layout (General section)

General
├── AI Provider
│   ├── Active LLM provider:  [ OpenAI ▾ ]
│   ├── (provider help text)
│   └── Data handling
│       ├── OpenAI: API inputs are not used to train models by default. Standard retention is 30 days...
│       └── Anthropic: API inputs are not used to train models by default. Standard retention is 30 days...
├── OpenAI
│   └── (existing fields — unchanged)
├── Anthropic (Claude)
│   ├── API Key
│   ├── Base URL (Optional)
│   └── Default Model (Optional)
└── BrandFetch

Test plan

• test/controllers/settings/hostings_controller_test.rb — 5 new tests:
  • update anthropic access token
  • "********" placeholder ignored (no overwrite of a stored key)
  • update anthropic base_url + model together
  • switch llm_provider to anthropic
  • reject unknown llm_provider values
• Existing 26 hostings controller tests still pass (incl. the GET render exercising the three new partials).
• bundle exec erb_lint ./app/views/settings/hostings/_anthropic_settings.html.erb ./app/views/settings/hostings/_llm_provider_selector.html.erb ./app/views/settings/hostings/show.html.erb — no errors.
• Locale keys resolve via bin/rails runner I18n.t(...).
• Full suite: 4385 runs, 18092 assertions, 0 failures, 26 pre-existing skips, 1 pre-existing libvips env error.
• bin/rubocop clean on touched Ruby files.
• bin/brakeman --no-pager clean.

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch feature/anthropic-settings-ui

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