fix: enable immediate file saving for i18n translations (#7785)

## Summary

Fixes the pt-BR locale generation issue by enabling immediate file
persistence in the lobe-i18n configuration.

## Problem

The pt-BR locale was added in PR #6943 with proper infrastructure, but
translation files have remained empty (`{}`) despite the i18n workflow
running successfully on version-bump PRs.

### Root Cause

The `lobe-i18n` tool has a `saveImmediately` configuration option
(defaults to `false`) that controls whether translations are persisted
to disk immediately during generation. When bootstrapping from
completely empty `{}` JSON files, without `saveImmediately: true`, the
tool generates translations in memory but doesn't write them to disk,
resulting in empty files.

**Evidence:**
- All other locales: ~1,931 lines each (previously bootstrapped)
- pt-BR before fix: 1 line (`{}` in all 4 files)
- CI workflow runs successfully but pt-BR files remain empty
- After adding `saveImmediately: true`: 18,787 lines generated across
all 4 pt-BR files

## Solution

Add `saveImmediately: true` to `.i18nrc.cjs` configuration:

```javascript
module.exports = defineConfig({
  modelName: 'gpt-4.1',
  splitToken: 1024,
  saveImmediately: true,  // ← Enables immediate file persistence
  entry: 'src/locales/en',
  entryLocale: 'en',
  output: 'src/locales',
  outputLocales: ['zh', 'zh-TW', 'ru', 'ja', 'ko', 'fr', 'es', 'ar', 'tr', 'pt-BR'],
  // ...
});
```

This ensures that when lobe-i18n generates translations from empty
files, they are immediately written to disk rather than kept only in
memory.

## Validation

This PR's commit history demonstrates the fix works:

1. **Commit `22e6e28f5`**: Applied the `saveImmediately: true` fix
2. **Commit `cd7e93786`**: Temporarily enabled i18n workflow for this
branch (for testing)
3. **Commit `84545c218`**: CI successfully generated complete pt-BR
translations:
   - `commands.json`: 327 lines
   - `main.json`: 2,458 lines
   - `nodeDefs.json`: 15,539 lines
   - `settings.json`: 463 lines
   - **Total: 18,787 lines of Portuguese translations**
4. **Commits `85f282f98` & `05d097f7b`**: Reverted test commits to keep
PR minimal

## Changes

- `.i18nrc.cjs`: Added `saveImmediately: true` configuration option (+1
line)

## Impact

After this fix is merged, future `version-bump-*` PRs will automatically
generate and persist pt-BR translations alongside all other locales,
keeping Portuguese (Brazil) translations up-to-date with the codebase.

## References

- Original issue:
https://github.com/Comfy-Org/ComfyUI_frontend/pull/6943#issuecomment-3679664466
- Related PR: #6943 (Portuguese (Brazil) locale addition)
- lobe-i18n documentation:
https://github.com/lobehub/lobe-cli-toolbox/tree/master/packages/lobe-i18n

Fixes #6943 (comment)

---------

Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>

.i18nrc.cjs

@@ -6,6 +6,7 @@ const { defineConfig } = require('@lobehub/i18n-cli');
 module.exports = defineConfig({
   modelName: 'gpt-4.1',
   splitToken: 1024,
+  saveImmediately: true,
   entry: 'src/locales/en',
   entryLocale: 'en',
   output: 'src/locales',