refactor: format imports, fix indentation, and improve readability across files

Apply consistent import ordering and indentation in frontend and backend files. Ensure better maintainability and adherence to code style standards.

frontend/src/app/(dashboard)/upload/page.tsx

@@ -10,7 +10,13 @@ import { useForm } from "react-hook-form";
 import { toast } from "sonner";
 import * as z from "zod";
 import { Button } from "@/components/ui/button";
-import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import {
+	Card,
+	CardContent,
+	CardDescription,
+	CardHeader,
+	CardTitle,
+} from "@/components/ui/card";
 import {
 	Form,
 	FormControl,
@@ -28,10 +34,10 @@ import {
 	SelectTrigger,
 	SelectValue,
 } from "@/components/ui/select";
+import { Spinner } from "@/components/ui/spinner";
 import { useAuth } from "@/providers/auth-provider";
 import { CategoryService } from "@/services/category.service";
 import { ContentService } from "@/services/content.service";
-import { Spinner } from "@/components/ui/spinner";
 import type { Category } from "@/types/content";
 
 const uploadSchema = z.object({