chore: refactor project structure and clean up unused components

- Updated `TODO.md` to reflect new testing tasks and final structure expectations.
- Simplified TypeScript path mappings in `tsconfig.json` for better clarity.
- Revised business logic separation rules in `.cursor/rules` to align with new directory structure.
- Deleted unused client components and services to streamline the codebase.
- Adjusted import paths in scripts to match the new structure.

src/components/ui/Input.tsx

@@ -0,0 +1,44 @@
+import { InputHTMLAttributes, forwardRef } from 'react';
+import { cn } from '@/lib/utils';
+
+interface InputProps extends InputHTMLAttributes<HTMLInputElement> {
+  label?: string;
+  error?: string;
+}
+
+const Input = forwardRef<HTMLInputElement, InputProps>(
+  ({ className, label, error, ...props }, ref) => {
+    return (
+      <div className="space-y-2">
+        {label && (
+          <label className="block text-sm font-mono font-medium text-[var(--muted-foreground)] uppercase tracking-wider">
+            {label}
+          </label>
+        )}
+        <input
+          className={cn(
+            'w-full px-3 py-2 bg-[var(--input)] border border-[var(--border)]/50 rounded-lg',
+            'text-[var(--foreground)] font-mono text-sm placeholder-[var(--muted-foreground)]',
+            'focus:outline-none focus:ring-2 focus:ring-[var(--primary)]/50 focus:border-[var(--primary)]/50',
+            'hover:border-[var(--border)] transition-all duration-200',
+            'backdrop-blur-sm',
+            error && 'border-[var(--destructive)]/50 focus:ring-[var(--destructive)]/50 focus:border-[var(--destructive)]/50',
+            className
+          )}
+          ref={ref}
+          {...props}
+        />
+        {error && (
+          <p className="text-xs font-mono text-[var(--destructive)] flex items-center gap-1">
+            <span className="text-[var(--destructive)]">⚠</span>
+            {error}
+          </p>
+        )}
+      </div>
+    );
+  }
+);
+
+Input.displayName = 'Input';
+
+export { Input };