Refactor settings system and improve context initialization

Backend:
- Add type validation and coercion for settings API
- Implement SettingStorage and SettingType in registry
- Improve CRUD operations for settings

Frontend:
- Refactor Theme, Language, Sidebar, ViewMode contexts
- Simplify admin components (GeneralTab, SettingsTab, UsersTab)
- Add new settings endpoints to API client
- Improve App initialization flow

Infrastructure:
- Update Dockerfile and docker-compose.yml
- Add .dockerignore
- Update Makefile and README

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

README.md

@@ -12,11 +12,10 @@
  ## Technology Stack
  
  ### Frontend
- - React 18 + TypeScript
+ - React 19 + TypeScript
  - Vite (build tool)
- - Tailwind CSS + shadcn/ui
- - React Query (TanStack Query)
- - Zustand (state management)
+ - React Router
+ - Axios
  
  ### Backend
  - FastAPI (Python 3.11+)
@@ -100,4 +99,3 @@
  ## Contributing
  
  Feel free to fork and customize for your needs.
-