feat: add Requesty as a model provider

[Thibaultjaigu]

Summary

Adds Requesty — an OpenAI-compatible LLM router — as a model provider, mirroring the existing OpenRouter integration. Requesty exposes 400+ models through one endpoint, addressed as provider/model.

Targets dev per CONTRIBUTING.md.

Changes

Backend

• app/services/requesty_model_normalizer.py — normalizes Requesty's /v1/models catalogue. Requesty's payload differs from OpenRouter's: capabilities are flat booleans (supports_tool_calling / supports_vision / supports_image_generation) rather than an architecture block plus a supported_parameters array, and context size is context_window (not context_length). This module maps those onto the same normalized shape the rest of the backend consumes, mirroring openrouter_model_normalizer.py.
• app/services/provider_registry.py — Requesty ProviderSpec (OpenAI-compatible, base URL https://router.requesty.ai/v1, REQUESTY_API_KEY bearer auth)
• app/services/model_connection_service.py — key verification branch + async live model discovery
• app/services/quality_score.py — Requesty score entry (mirrors OpenRouter)
• tests/unit/services/test_requesty_model_normalizer.py — unit tests mirroring the OpenRouter normalizer coverage

Frontend

• Requesty provider icon + registration, metadata entry (with defaultBaseUrl), and base-url hint in the connect form

Testing

• The 5 normalizer unit tests pass.
• Verified live against https://router.requesty.ai/v1/models: the normalizer processed the real 605-model catalogue and produced 512 chat models (370 vision-capable), correctly reading context_window and the supports_* booleans.
• ruff check clean on the new Python files.

The provider icon is a neutral monochrome currentColor placeholder — happy to swap in an official Requesty brand asset if you prefer.

I work at Requesty. This mirrors the existing OpenRouter provider as closely as possible. Happy to adjust or close it if it's not a fit.

High-level PR Summary

This PR integrates Requesty, an OpenAI-compatible LLM router providing access to 400+ models, as a new model provider. The implementation closely mirrors the existing OpenRouter integration, adding backend model normalization logic to handle Requesty's specific API schema (flat boolean capabilities like supports_tool_calling and supports_vision, and context_window sizing), along with provider registration, authentication, and model discovery. Frontend changes include adding the Requesty provider icon, metadata configuration with default base URL, and UI hints for the connection form. The normalizer filters for chat models with tool-calling support and sufficient context length (≥100k tokens), excluding certain providers like Amazon.

⏱️ Estimated Review Time: 15-30 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_backend/app/services/requesty_model_normalizer.py
2	surfsense_backend/tests/unit/services/test_requesty_model_normalizer.py
3	surfsense_backend/app/services/provider_registry.py
4	surfsense_backend/app/services/model_connection_service.py
5	surfsense_backend/app/services/quality_score.py
6	surfsense_web/components/icons/providers/requesty.svg
7	surfsense_web/components/icons/providers/index.ts
8	surfsense_web/lib/provider-icons.tsx
9	surfsense_web/components/settings/model-connections/provider-metadata.tsx
10	surfsense_web/components/settings/model-connections/default-connect-form.tsx

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