feat: remove appwrite and add nextjs backend

backend/src/share/dto/shareSecurity.dto.ts

@@ -0,0 +1,12 @@
+import { IsNumber, IsOptional, IsString, Length } from "class-validator";
+
+export class ShareSecurityDTO {
+  @IsString()
+  @IsOptional()
+  @Length(3, 30)
+  password: string;
+
+  @IsNumber()
+  @IsOptional()
+  maxViews: number;
+}