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-Frontend/src/lib/treatments/types.ts

@@ -13,6 +13,9 @@ export interface Treatment {
   batchNumber: string | null;
   notes: string | null;
   withdrawalPeriodDays: number | null;
+  supplier: string | null;
+  purchaseProof: string | null;
+  prescribingVet: string | null;
   createdAt: string;
 }
 
@@ -29,6 +32,9 @@ export interface CreateTreatmentInput {
   batchNumber?: string;
   notes?: string;
   withdrawalPeriodDays?: number;
+  supplier?: string;
+  purchaseProof?: string;
+  prescribingVet?: string;
 }
 
 export interface UpdateTreatmentInput {
@@ -45,6 +51,9 @@ export interface UpdateTreatmentInput {
   batchNumber?: string;
   notes?: string;
   withdrawalPeriodDays?: number;
+  supplier?: string;
+  purchaseProof?: string;
+  prescribingVet?: string;
 }
 
 export interface WithdrawalStatus {