Add case identity filters and description validation

src/request-management/dto/create-request-management.dto.ts

@@ -1,5 +1,5 @@
 import { ApiProperty, ApiPropertyOptional } from "@nestjs/swagger";
-import { IsNotEmpty, IsOptional, IsString } from "class-validator";
+import { IsOptional, IsString } from "class-validator";
 import { Types } from "mongoose";
 import { AddPlateDto } from "src/profile/dto/user/AddPlateDto";
 import { StepsEnum } from "src/Types&Enums/blame-request-management/steps.enum";
@@ -51,8 +51,13 @@ export class FirstPartyFileDto {
 }
 
 export class DescriptionDto {
-  @ApiProperty({ description: "Accident description (required for all types)" })
-  desc: string;
+  @ApiPropertyOptional({
+    description:
+      "Accident description. Optional for THIRD_PARTY; CAR_BODY requires at least 100 non-whitespace characters.",
+  })
+  @IsOptional()
+  @IsString()
+  desc?: string;
 
   @ApiPropertyOptional({
     description: "CAR_BODY only. Ignored for THIRD_PARTY.",
@@ -94,10 +99,13 @@ export class DescriptionDto {
  * front-end can display them consistently regardless of blame type.
  */
 export class DescriptionV4Dto {
-  @ApiProperty({ description: "Accident description" })
+  @ApiPropertyOptional({
+    description:
+      "Accident description. Optional for THIRD_PARTY; CAR_BODY requires at least 100 non-whitespace characters.",
+  })
+  @IsOptional()
   @IsString()
-  @IsNotEmpty()
-  desc: string;
+  desc?: string;
 
   @ApiPropertyOptional({
     description: