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.

backend/internal/database/database.go

@@ -1,18 +0,0 @@
-package database
-
-import (
-	"fmt"
-
-	"gorm.io/driver/sqlite"
-	"gorm.io/gorm"
-)
-
-// Connect opens a SQLite database connection.
-func Connect(dbPath string) (*gorm.DB, error) {
-	db, err := gorm.Open(sqlite.Open(dbPath), &gorm.Config{})
-	if err != nil {
-		return nil, fmt.Errorf("open database: %w", err)
-	}
-
-	return db, nil
-}