feat(web): add price range filter and list view to /du-an page

Add minPrice/maxPrice inputs to ProjectFilterBar and introduce a
list view mode alongside the existing grid/map toggle for project
browsing.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/modules/analytics/presentation/dto/avm-compare-query.dto.ts

@@ -0,0 +1,19 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { Transform } from 'class-transformer';
+import { ArrayMaxSize, ArrayMinSize, IsArray, IsString } from 'class-validator';
+
+export class AvmCompareQueryDto {
+  @ApiProperty({
+    description: 'Comma-separated property IDs to compare (2-5)',
+    example: 'prop-1,prop-2,prop-3',
+    type: String,
+  })
+  @Transform(({ value }) =>
+    typeof value === 'string' ? value.split(',').map((s: string) => s.trim()).filter(Boolean) : value,
+  )
+  @IsArray()
+  @ArrayMinSize(2)
+  @ArrayMaxSize(5)
+  @IsString({ each: true })
+  ids!: string[];
+}