feat: add n1n.ai as a built-in provider

[n1n-api]

Integrated n1n.ai as a built-in provider with default models and settings.

Summary by CodeRabbit

• New Features

  • Added support for the N1N AI provider with multiple models (including GPT‑4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, and DeepSeek variants)
  • Added a visual indicator for the N1N provider in the UI

• Localization

  • Added N1N translations for English and Simplified Chinese

• Bug Fix / UI

  • Minor SVG icon formatting tweak for improved icon rendering

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Walkthrough

Adds a new provider "N1N" (id: n1n) across enum, system defaults (API host, models), OpenAI-compatible settings mapping, icon rendering, and English/zh-Hans localization entries.

Changes

Cohort / File(s)	Summary
Provider Type Definition src/shared/types/provider.ts	Added enum member N1N = 'n1n' to ModelProviderEnum.
Provider Configuration src/shared/defaults.ts	Added a SystemProviders entry for N1N with urls.website, defaultSettings.apiHost = "https://api.n1n.ai/v1", and multiple OpenAI-compatible model entries (modelId, nickname, capabilities, contextWindow).
Provider Settings Mapping src/renderer/packages/model-setting-utils/index.ts	Mapped ModelProviderEnum.N1N to OpenAISettingUtil so N1N uses OpenAI-compatible settings handling.
UI Icons src/renderer/components/icons/ProviderIcon.tsx	Added JSX branch to render N1N provider icon; minor SVG path formatting tweak for MistralAI observed.
Localization src/renderer/i18n/locales/en/translation.json, src/renderer/i18n/locales/zh-Hans/translation.json	Added translation key/value "n1n.ai": "n1n.ai" for English and Simplified Chinese locales.

Sequence Diagram(s)

(Skipped — changes add a provider and static assets/configurations without introducing a new multi-component runtime flow requiring a sequence diagram.)

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Adding MistralAI #2514: Adds MistralAI provider support with similar edits to ProviderIcon, model-setting-utils, SystemProviders, and ModelProviderEnum — closely related integration pattern.

Suggested reviewers

• themez

Poem

🐰 A little hop, a tiny spin,
N1N arrives with a cheerful grin,
Models lined up, icons shown bright,
Translations set — the meadow's right! 🥕✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding n1n.ai as a built-in provider, which aligns with all modifications across multiple files.

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✨ Finishing touches

• 📝 Generate docstrings

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[n1n-api]

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Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@src/renderer/components/icons/ProviderIcon.tsx`:
- Line 106: The SVG path in ProviderIcon.tsx contains a merge artifact
"1External 1" inside the d attribute; locate the <path> with the long d string
(the XAI provider icon) and remove the "External" artifact so the commands and
numbers are contiguous (e.g., change "...-1.829-1External 1A8.975..." to a valid
sequence like "...-1.829-1.1A8.975..." or whatever the original numeric token
was), ensuring the path uses only valid SVG commands and numbers; after editing,
validate the SVG by opening the component in the browser or running an SVG
linter/validator to confirm it renders correctly.

[n1n-api]

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