Remove Settings and Setup pages along with their tests and related API services

- Deleted Settings.tsx and Setup.tsx pages, which included functionality for changing passwords and setting up an admin account.
- Removed associated test files for Setup page.
- Eliminated API service definitions related to proxy hosts, remote servers, import functionality, and health checks.
- Cleaned up mock data and test setup files.
- Removed configuration files for TypeScript, Vite, and Tailwind CSS.
- Deleted scripts for testing coverage, release management, Dockerfile validation, and Python compilation checks.
- Removed Sourcery pre-commit wrapper script.

frontend/src/context/ThemeContext.tsx

@@ -1,42 +0,0 @@
-import { createContext, useContext, useEffect, useState, ReactNode } from 'react'
-
-type Theme = 'dark' | 'light'
-
-interface ThemeContextType {
-  theme: Theme
-  toggleTheme: () => void
-}
-
-const ThemeContext = createContext<ThemeContextType | undefined>(undefined)
-
-export function ThemeProvider({ children }: { children: ReactNode }) {
-  const [theme, setTheme] = useState<Theme>(() => {
-    const saved = localStorage.getItem('theme')
-    return (saved as Theme) || 'dark'
-  })
-
-  useEffect(() => {
-    const root = window.document.documentElement
-    root.classList.remove('light', 'dark')
-    root.classList.add(theme)
-    localStorage.setItem('theme', theme)
-  }, [theme])
-
-  const toggleTheme = () => {
-    setTheme(prev => prev === 'dark' ? 'light' : 'dark')
-  }
-
-  return (
-    <ThemeContext.Provider value={{ theme, toggleTheme }}>
-      {children}
-    </ThemeContext.Provider>
-  )
-}
-
-export function useTheme() {
-  const context = useContext(ThemeContext)
-  if (context === undefined) {
-    throw new Error('useTheme must be used within a ThemeProvider')
-  }
-  return context
-}