feat: add image context model for Claude proxy

[Pswzy]

Summary

• Add an optional image processing model for Claude and Claude Desktop proxy providers.
• When a request contains images, the proxy first asks the configured image model to extract image context, then removes image blocks and injects the extracted text back into the original message order before forwarding to the main mapped model.
• Keep existing unsupported-image fallback behavior when no image model is configured.

Details

• Adds ProviderMeta.imageModel and matching frontend provider form fields with i18n strings.
• Supports Anthropic image blocks plus OpenAI-style input_image/image_url data URL blocks and nested image MIME metadata.
• Avoids recursive image preprocessing/model mapping for the image-analysis request.
• Uses an English internal analysis protocol while preserving parsing compatibility for Chinese image-analysis section labels.
• Automatically enables Claude Code proxy takeover when the active provider has an image model, and restores it when switching to providers without one.

Tests

• pnpm typecheck
• pnpm test:unit
• cargo +stable test image_context::tests
• cargo +stable test media_sanitizer::tests
• cargo +stable test provider_meta_serializes_image_model

[farion1231]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Only disable Claude takeover for the provider being edited

When editing any Claude provider that does not have an imageModel, this branch turns off proxy takeover whenever isProxyTakeover is true, without checking whether the edited provider is the current provider. If the current provider still relies on an image model and the user edits an inactive text-only provider, Claude Code gets restored away from the proxy and image-context routing stops working for the active provider. The disable path should mirror the enable path by first confirming the updated/original id is the current provider.

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[Pswzy]

Updated the PR to address the automated review and CI formatting failure.\n\nChanges in the follow-up commit:\n- Guard the Claude proxy takeover disable path so it only runs when the edited provider is the current provider, matching the enable path.\n- Added a focused useProviderActions test covering inactive text-only provider edits while Claude proxy takeover is active.\n- Ran Prettier on the files flagged by CI.\n\nVerified locally:\n- pnpm format:check\n- pnpm typecheck\n- pnpm exec vitest run tests/hooks/useProviderActions.test.tsx\n- pnpm test:unit

[makoMakoGo]

Updated the PR to address the automated review and CI formatting failure.\n\nChanges in the follow-up commit:\n- Guard the Claude proxy takeover disable path so it only runs when the edited provider is the current provider, matching the enable path.\n- Added a focused useProviderActions test covering inactive text-only provider edits while Claude proxy takeover is active.\n- Ran Prettier on the files flagged by CI.\n\nVerified locally:\n- pnpm format:check\n- pnpm typecheck\n- pnpm exec vitest run tests/hooks/useProviderActions.test.tsx\n- pnpm test:unit

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