Add Persian (Farsi) language support (#7876)

## Description

This PR adds Persian (Farsi) language support to ComfyUI. 

## Changes

- Added `fa` to output locales in `.i18nrc.cjs` with Persian-specific
translation guidelines
- Added Persian loaders for all translation files (main, nodeDefs,
commands, settings) in `src/i18n.ts`
- Added Persian (فارسی) option to language settings dropdown in
`src/platform/settings/constants/coreSettings.ts`
- Created empty Persian locale files in `src/locales/fa/` directory
(will be populated by the CI translation system)

## Translation Guidelines

The Persian translation will follow these guidelines:
- Use formal Persian (فارسی رسمی) for professional tone throughout the
UI
- Keep commonly used technical terms in English when they are standard
in Persian software (e.g., node, workflow)
- Use Arabic-Indic numerals (۰-۹) for numbers where appropriate
- Maintain consistency with terminology used in Persian software and
design applications

## Testing

The configuration has been tested to ensure:
- TypeScript compilation succeeds
- All four translation files are properly referenced
- Language option appears correctly in settings

## Notes

Following the contribution guidelines in `src/locales/CONTRIBUTING.md`,
the empty translation files will be automatically populated by the CI
system using OpenAI. Persian-speaking contributors can review and refine
these translations after the automated generation.

---

Special names to keep untranslated: flux, photomaker, clip, vae, cfg,
stable audio, stable cascade, stable zero, controlnet, lora, HiDream,
Civitai, Hugging Face

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7876-Add-Persian-Farsi-language-support-2e16d73d365081f69df0e50048ce87ba)
by [Unito](https://www.unito.io)

Co-authored-by: danialshirali16 <danialshirali16@users.noreply.github.com>

src/platform/settings/constants/coreSettings.ts

@@ -410,7 +410,8 @@ export const CORE_SETTINGS: SettingParams[] = [
       { value: 'es', text: 'Español' },
       { value: 'ar', text: 'عربي' },
       { value: 'tr', text: 'Türkçe' },
-      { value: 'pt-BR', text: 'Português (BR)' }
+      { value: 'pt-BR', text: 'Português (BR)' },
+      { value: 'fa', text: 'فارسی' }
     ],
     defaultValue: () => navigator.language.split('-')[0] || 'en'
   },