feat(ai): add Requesty provider

[Thibaultjaigu]

Summary

Adds Requesty (an OpenAI-compatible LLM gateway) as a disabled built-in provider, following the same pattern as the OrcaRouter entry from #718. It uses the existing OpenAI-compatible transport, so no new request code paths.

Changes

• packages/providers/src/catalog.ts: new requesty template (base URL https://router.requesty.ai/v1, disabled by default) seeded with managed model ids (gpt-5.6-sol, claude-fable-5, claude-opus-5, claude-sonnet-5, gemini-3.6-flash)
• packages/providers/src/provider-capabilities.ts: enable model discovery for requesty
• packages/providers/src/requests.ts: model list uses GET /models/managed (Requesty's curated list), and capabilities are read from the supports_vision, supports_reasoning and supports_tool_calling fields. Any id from the full /models catalog (e.g. openai/gpt-4o-mini) can still be added by hand
• packages/providers/src/settings.ts: existing settings get the new entry appended, same as OrcaRouter (turned the single OrcaRouter block into a loop over both ids)
• packages/providers/src/thinking-format.ts: when thinking is on, send reasoning_effort: "high" and nothing else. When it is off, send nothing
• packages/app/src/components/AiProviderBadge.tsx plus requesty.svg logo
• README (en and zh-CN) built-in provider list
• Tests next to the OrcaRouter ones for the catalog entry, discovery, migration, thinking format, adapter request shape, streaming and the badge. The two OrcaRouter migration tests now expect one more appended provider

Requesty is not the default and is not added to any automatic selection. For EU routing, set the API URL to https://router.eu.requesty.ai/v1.

How to test

1. Get a key at https://app.requesty.ai/api-keys (docs: https://docs.requesty.ai)
2. Settings > AI > Requesty: paste the key, enable, click refresh models
3. Pick gpt-5.6-sol or add openai/gpt-4o-mini and run inline AI or the side panel

Verification

• pnpm --filter @markra/providers test: 54 passed
• pnpm --filter @markra/ai test: 266 passed
• pnpm --filter @markra/app test: 1639 passed
• apps/web and apps/desktop vitest: 50 and 175 passed
• pnpm run typecheck:test: pass
• pnpm build for @markra/providers, @markra/ai, @markra/app and apps/web: pass (skipped the Tauri desktop build)
• Live, through fetchAiProviderModels, testAiProviderConnection, chatCompletion and chatCompletionStream with a real key: 159 managed models listed, valid key connects and an invalid key is rejected (403), openai/gpt-4o-mini chat returned 200, and gpt-5.6-sol streamed with thinking on. I also checked every seeded model live with temperature: 0.7 and reasoning_effort: "high"

No UI layout changes apart from the new logo in the provider list.

Disclosure: I work at Requesty. Happy to adjust anything to match project conventions.

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[murongg]

Please address the two provider behavior issues below before merging.

Reviewed commit: a7b04d3.

Validation: 54 provider tests, 266 AI tests, and 13 focused app tests passed. Provider/AI builds and test typechecks, plus the app TypeScript build, passed. Supplemental synthetic probes reproduced the capability-metadata override and showed that explicitly disabled thinking produces the same request options as an unspecified setting. Public model-list and invalid-key responses were checked; live paid inference was not performed.

[Thibaultjaigu]

@murongg thanks for the review. Both points are addressed in c0db033 and 3b0a430, and the branch is rebased on the latest v2. Provider and AI tests, their builds and test typechecks, the focused app tests and the app build pass locally. The thinking thread has the live numbers behind the "min" choice and one Anthropic caveat. Could you take another look?