Internationalize to Korean and refactor provider configuration

[Photometry4040]

Summary

This PR introduces Korean language support (ko-KR) as the new default language and refactors the AI provider configuration system to focus on local-first and open-source models. The changes include comprehensive Korean localization, simplified provider registry, and removal of cloud-based provider dependencies.

Key Changes

Localization & Internationalization

• Added complete Korean (ko-KR) translations for all UI modules:
  • settings.json, ui.json, notebook.json, chat.json, quiz.json, anki.json, shortcuts.json, common.json
• Removed Chinese (zh-CN) locale files as part of language consolidation
• Changed default language from en-US to ko-KR and default theme from dark to light
• Updated all code comments and documentation strings from Chinese to Korean throughout the codebase

Provider Configuration Refactoring

• Changed default active provider from deepseek to lmstudio (local-first approach)
• Simplified defaultBaseUrls to focus on local and open-source providers:
  • Added LM Studio: http://localhost:1234/v1
  • Kept Ollama: http://localhost:11434/api
  • Kept OpenAI and DeepSeek for cloud options
  • Removed: Qwen, Kimi, SiliconFlow, Zhipu
• Removed model configuration files for removed providers:
  • qwen.ts, kimi.ts, siliconflow.ts, zhipu.ts
• Added new lmstudio.ts model configuration with common local LLM models
• Updated AISDKProvider to remove Qwen-specific imports and focus on OpenAI-compatible APIs

Service & Configuration Updates

• Updated service file headers and comments to Korean
• Disabled auto-update service for on-premise deployment
• Removed GitHub publish configuration from electron-builder.yml
• Removed npm mirror configuration from .npmrc for standard npm registry usage
• Updated language type definitions to include ko-KR and remove zh-CN

UI/UX Adjustments

• Updated theme colors in theme.css for improved light theme appearance
• Changed default settings to use light theme and Korean language
• Updated language selector to reflect new language options

Implementation Details

• All Korean translations maintain consistency with existing English translations
• Provider configuration changes maintain backward compatibility through configuration migration
• Local-first approach prioritizes LM Studio and Ollama for privacy and offline usage
• Comments throughout codebase systematically converted to Korean for consistency

https://claude.ai/code/session_01NjT86A3ToSTS8zZLmvndXG

[Photometry4040]

한국어화 작업