feat: add OrcaRouter as a named model provider

[Marc-oss-hub]

What

Adds OrcaRouter as a first-class, named model provider in SurfSense, mirroring the existing OpenRouter/Requesty integration pattern.

OrcaRouter is an OpenAI-compatible model gateway that lets you reach models from many providers through one key (e.g. openai/gpt-5.5, anthropic/claude-sonnet-5). It also provides gateway-level security controls for AI agents.

Changes

• surfsense_backend/app/services/provider_registry.py — register orcarouter as an OpenAI-compatible provider with discovery (openai_models), base URL https://api.orcarouter.ai/v1, and bearer auth, matching the existing requesty/openrouter entries.
• surfsense_web/components/icons/providers/orcarouter.svg — new provider icon.
• surfsense_web/components/icons/providers/index.ts — export the new icon.
• surfsense_web/lib/provider-icons.tsx — render the icon for ORCAROUTER connections.
• surfsense_web/components/settings/model-connections/provider-metadata.tsx — add orcarouter to the provider order/display metadata.
• surfsense_web/components/settings/model-connections/default-connect-form.tsx — show the base-URL hint for OrcaRouter connections.

Verification

• L3 live test against the real gateway passed: GET https://api.orcarouter.ai/v1/models with an sk-orca- key returns 200 and a model list that includes namespaced slugs like openai/gpt-5.5, orcarouter/free, and orcarouter/fusion.
• Config format follows the existing provider contract: OPENAI_COMPATIBLE transport + OPENAI_BASE_URL-style base URL, so no backend routing changes are needed.

I'm an engineer on the OrcaRouter team.

High-level PR Summary

This PR adds OrcaRouter as a named model provider in SurfSense, following the same integration pattern as existing OpenAI-compatible gateways like OpenRouter and Requesty. The changes register OrcaRouter in the backend provider registry with its API endpoint (https://api.orcarouter.ai/v1), add the provider icon and UI metadata for display in the settings interface, and include the base URL hint for connection configuration.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_backend/app/services/provider_registry.py
2	surfsense_web/components/icons/providers/orcarouter.svg
3	surfsense_web/components/icons/providers/index.ts
4	surfsense_web/lib/provider-icons.tsx
5	surfsense_web/components/settings/model-connections/provider-metadata.tsx
6	surfsense_web/components/settings/model-connections/default-connect-form.tsx

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