Add 76 LLM providers and generalized Ask streaming

[esokullu]

Summary

• Add 76 built-in provider cards through mirrored Chrome and Firefox catalogs, with provider-specific endpoints, authentication fields, model defaults, capability metadata, and 152 checked-in SVG icons.
• Add direct support for Azure AI Foundry, Vertex AI, Vertex Anthropic, Perplexity Responses, Cloudflare AI Gateway, and the remaining OpenCode-derived OpenAI-compatible providers.
• Generalize interactive Ask streaming across capable providers, require terminal protocol events, retry interrupted streams once without streaming, surface a localized fallback notice, and estimate usage when providers omit token metadata.
• Update English, French, and Chinese documentation, localized READMEs, and website provider pages.
• Deliberately exclude GitHub Models, GitHub Copilot, GitLab Duo, and SAP AI Core because of retirement or incompatible OAuth/discovery requirements.

Why

WebBrain's provider settings were largely maintained as bespoke entries and Ask streaming was limited to the original OpenAI path. This change moves the expanded catalog into deterministic mirrored metadata, adds the required protocol adapters, and keeps streaming failures and cost accounting safe across providers.

User impact

New providers start disabled and existing stored configurations and active-provider selection remain intact. Users can configure direct API-key providers without interactive OAuth, search the expanded catalog, and receive streamed Ask responses wherever the selected adapter supports a complete streaming protocol.

Validation

• node --check on 69 changed JavaScript files
• npm test — 1,250 core tests passed
• injection corpus — 60/60 checks passed
• npm run build:web
• npm run build:zip from committed HEAD; Chrome, Edge, and Firefox archives contain the new catalog and icons
• git diff --check

[chatgpt-codex-connector]

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[esokullu]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Chef's kiss.

Reviewed commit: e9643a67f1

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