feat(export): Bestandsbuch für Tierarzneimittel nach Art. 108 VO (EU) 2019/6

- Treatment records supplier, purchase proof and prescribing vet, and
  keeps the apiary the colony stood at on the treatment day.
- Holder name and address in site settings (never in public output;
  regression test in public.service.spec).
- treatment-log.pdf: one sheet per apiary, identical treatments grouped,
  missing mandatory fields printed as FEHLT, uncertain locations marked.
- Shared PDF table helpers extracted from the record card.

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

ApiCore-Backend/src/site-settings/dto/update-site-settings.dto.ts

@@ -1,5 +1,11 @@
 import { ApiPropertyOptional } from '@nestjs/swagger';
-import { IsOptional, IsUrl, MaxLength, ValidateIf } from 'class-validator';
+import {
+  IsOptional,
+  IsString,
+  IsUrl,
+  MaxLength,
+  ValidateIf,
+} from 'class-validator';
 
 // An empty string clears the link (stored as null); anything else must be a
 // real URL - ValidateIf skips the @IsUrl check only for the empty-string
@@ -32,4 +38,18 @@ export class UpdateSiteSettingsDto {
   @IsUrl({ require_protocol: true })
   @MaxLength(300)
   websiteUrl?: string;
+
+  @ApiPropertyOptional({ description: 'Name des Bienenhalters (Bestandsbuch)' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(200)
+  holderName?: string;
+
+  @ApiPropertyOptional({
+    description: 'Anschrift des Bienenhalters (Bestandsbuch)',
+  })
+  @IsOptional()
+  @IsString()
+  @MaxLength(300)
+  holderAddress?: string;
 }

ApiCore-Backend/src/site-settings/site-settings.service.ts

@@ -52,6 +52,14 @@ export class SiteSettingsService {
           dto.websiteUrl !== undefined
             ? emptyToNull(dto.websiteUrl)
             : undefined,
+        holderName:
+          dto.holderName !== undefined
+            ? emptyToNull(dto.holderName.trim())
+            : undefined,
+        holderAddress:
+          dto.holderAddress !== undefined
+            ? emptyToNull(dto.holderAddress.trim())
+            : undefined,
       },
     });
     await this.auditLog.record({