feat: T4 wave 3 - notifications per user, suggestions API, varroa bands, split/queen events

- Schema III: per-user notifications (broadcast fan-out migration,
  category, link, requiredPermissions filter), notification preferences
  and settings endpoints, calendar withdrawal switch, occupiedFrames
- Suggestions API: list/summary with permission visibility and paging,
  accept/dismiss/reopen incl. bulk, SuggestionView on all responses
- Varroa traffic light by season and method, young colonies, treatment
  effect window, sample-based percentage; shared withdrawal-window helper
  on Berlin calendar days; GET /varroa-measurements/thresholds
- ColonySplit and QueenAssigned domain events with calendar and webhook
  handlers
- Outbox claims compare against now() rounded to timestamp(3); fixes the
  flaky e2e claims of rows written with SQL now()

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Backend/src/colonies/dto/split-colony.dto.ts

@@ -1,6 +1,6 @@
 import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
-import { IsEnum, IsOptional, IsString } from 'class-validator';
-import { ColonyType } from '../../../generated/prisma';
+import { IsEnum, IsOptional, IsString, Matches } from 'class-validator';
+import { ColonyType, SplitQueenSource } from '../../../generated/prisma';
 
 export class SplitColonyDto {
   @ApiProperty()
@@ -15,4 +15,16 @@ export class SplitColonyDto {
   @IsOptional()
   @IsString()
   notes?: string;
+
+  @ApiPropertyOptional({
+    description: 'Day of the split (YYYY-MM-DD), not after today.',
+  })
+  @IsOptional()
+  @Matches(/^\d{4}-\d{2}-\d{2}$/, { message: 'date must be YYYY-MM-DD' })
+  date?: string;
+
+  @ApiPropertyOptional({ enum: SplitQueenSource })
+  @IsOptional()
+  @IsEnum(SplitQueenSource)
+  queenSource?: SplitQueenSource;
 }