feat(backend): Dokumente und Bilder mit lokalem Datei-Upload (Modul 29)

DocumentsModule (Document: entityType/entityId, Dateiname, MIME-Typ,
Groesse, Speicherpfad, Hochgeladen-von) fuer Bienenstand/Volk/Koenigin/
Durchsicht/Honigcharge. Upload als multipart/form-data (Multer, 10 MB
Limit, MIME-Allowlist jpeg/png/webp/pdf), Speicherung unter
DOCUMENTS_STORAGE_PATH (austauschbar). ARCHITECTURE.md Annahme 7
dokumentiert die Multi-Replica-Einschraenkung ohne geteiltes Volume.

ApiCore-Backend/prisma/migrations/20260823091941_documents/migration.sql

@@ -0,0 +1,23 @@
+-- CreateEnum
+CREATE TYPE "DocumentEntityType" AS ENUM ('APIARY', 'COLONY', 'QUEEN', 'INSPECTION', 'HONEY_BATCH');
+
+-- CreateTable
+CREATE TABLE "Document" (
+    "id" TEXT NOT NULL,
+    "entityType" "DocumentEntityType" NOT NULL,
+    "entityId" TEXT NOT NULL,
+    "fileName" TEXT NOT NULL,
+    "mimeType" TEXT NOT NULL,
+    "sizeBytes" INTEGER NOT NULL,
+    "storagePath" TEXT NOT NULL,
+    "uploadedByUserId" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "Document_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "Document_entityType_entityId_idx" ON "Document"("entityType", "entityId");
+
+-- AddForeignKey
+ALTER TABLE "Document" ADD CONSTRAINT "Document_uploadedByUserId_fkey" FOREIGN KEY ("uploadedByUserId") REFERENCES "User"("id") ON DELETE SET NULL ON UPDATE CASCADE;

ApiCore-Backend/prisma/schema.prisma

@@ -53,6 +53,7 @@ model User {
   notifications      Notification[]
   queenEvaluations   QueenEvaluation[]
   webhookSubscriptions WebhookSubscription[]
+  documents            Document[]
 
   @@index([role])
 }
@@ -773,3 +774,30 @@ model WebhookSubscription {
 
   @@index([active])
 }
+
+// ---------------------------------------------------------------------------
+// Dokumente und Bilder (Abschnitt 4.28) – v1.x Modul 29
+// ---------------------------------------------------------------------------
+
+enum DocumentEntityType {
+  APIARY
+  COLONY
+  QUEEN
+  INSPECTION
+  HONEY_BATCH
+}
+
+model Document {
+  id               String             @id @default(cuid())
+  entityType       DocumentEntityType
+  entityId         String
+  fileName         String
+  mimeType         String
+  sizeBytes        Int
+  storagePath      String
+  uploadedByUserId String?
+  uploadedByUser   User?              @relation(fields: [uploadedByUserId], references: [id])
+  createdAt        DateTime           @default(now())
+
+  @@index([entityType, entityId])
+}