feat: add full Russian language support; update Readme.md files, and .gitignore update (#514)

* feat: add Russian locale

- Add ru translations and register namespaces

- Add Russian to supported languages list

- Ignore .gemini workspace config

* fix: improve Russian plural forms in sidebar translations

Add proper Russian plural forms (few/many) for correct grammar with different count values

* docs(readme): add Russian translation and fix language switcher order

- Create README.ru.md based on the current English README.
- Update language switchers in all localized README files so
    English comes first, Russian second, and the remaining
    languages follow.
- Fix the issue where the current language was not shown
    correctly in the switcher for some localized README files

* fix(readme): fix language switcher positions and markdown issues

- Fix language switcher positions in README.md.
- Add bash language tags to command code blocks in README.ru.md.

* fix(readme): fix tool setup step numbering

- Fix tool setup step numbering in README.md and localized README files.

* fix(gitignore): allow translation task files to be tracked

Add exceptions to .gitignore for task translation files across multiple locales
(en, ja, ru, ko, zh-CN) to enable version control of translated content while
keeping generated task files ignored.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

* feat(i18n): add Russian translation for tasks

Add Russian locale translation file for TaskMaster task management interface.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

* fix: ignore missing tasks.json files for ko and zh-cn locales

* Delete .worktrees directory

---------

Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>

src/i18n/languages.js

@@ -29,6 +29,11 @@ export const languages = [
     label: 'Japanese',
     nativeName: '日本語',
   },
+  {
+    value: 'ru',
+    label: 'Russian',
+    nativeName: 'Русский',
+  },
 ];
 
 /**