feat: implement toCamelCase utility function and update Clean Architecture generator to use it

src/utils/name-formatter.ts

@@ -0,0 +1,12 @@
+/**
+ * Converts a PascalCase name to camelCase by lowercasing the first character.
+ * Used to derive class filenames and variable names from schema/tag names.
+ *
+ * @example
+ * toCamelCase('ProductResponse') // 'productResponse'
+ * toCamelCase('UserSchema')      // 'userSchema'
+ */
+export function toCamelCase(name: string): string {
+  if (!name) return name;
+  return name.charAt(0).toLowerCase() + name.slice(1);
+}