refactor: 전체 프론트엔드 하드코딩 색상 → CSS 변수 일괄 치환

447+ 파일, 4500+ 줄 변경:
- gray-* → border/bg-muted/text-foreground/text-muted-foreground
- blue-* → primary/ring
- red-* → destructive
- green-* → emerald (일관성)
- indigo-* → primary
- yellow/orange → amber (통일)
- dark mode 변형도 시맨틱 토큰으로 변환

Made-with: Cursor

frontend/lib/registry/components/category-select/CategorySelectComponent.tsx

@@ -143,7 +143,7 @@ export const CategorySelectComponent: React.FC<
         className="text-sm font-medium whitespace-nowrap"
       >
         {label}
-        {required && <span className="text-orange-500 ml-0.5">*</span>}
+        {required && <span className="text-amber-500 ml-0.5">*</span>}
       </Label>
     );
   };