feat: implement backend label print agent system for remote label rendering and job management

paperless-backend/src/database/entities/barcode-template.entity.ts

@@ -8,6 +8,17 @@ import {
 
 export type BarcodeActionType = 'SEND_TO_PAPERLESS' | 'SEND_BY_EMAIL';
 
+export interface LabelInputField {
+  name: string;
+  label: string;
+  type: 'text' | 'number' | 'date';
+}
+
+export type LabelElement =
+  | { type: 'text'; content: string; x: number; y: number; fontSize: number; bold?: boolean; align?: 'left' | 'center' | 'right'; maxWidth?: number }
+  | { type: 'qr';   content: string; x: number; y: number; sizeMm: number }
+  | { type: 'line'; x1: number; y1: number; x2: number; y2: number; lineWidth?: number };
+
 @Entity('barcode_templates')
 export class BarcodeTemplate {
   @PrimaryGeneratedColumn()
@@ -28,6 +39,31 @@ export class BarcodeTemplate {
   @Column({ type: 'json' })
   Actions!: BarcodeActionType[];
 
+  // ── Label-Konfiguration ─────────────────────────────────────
+  @Column({ type: 'boolean', default: false })
+  LabelEnabled!: boolean;
+
+  @Column({ type: 'int', nullable: true })
+  LabelWidthMm!: number | null;
+
+  @Column({ type: 'int', nullable: true })
+  LabelHeightMm!: number | null;
+
+  @Column({ type: 'json', nullable: true })
+  LabelInputFields!: LabelInputField[] | null;
+
+  @Column({ type: 'varchar', length: 1000, nullable: true })
+  LabelGetUrl!: string | null;
+
+  @Column({ type: 'varchar', length: 1000, nullable: true })
+  LabelPrintedUrl!: string | null;
+
+  @Column({ type: 'varchar', length: 1000, nullable: true })
+  LabelReleaseUrl!: string | null;
+
+  @Column({ type: 'json', nullable: true })
+  LabelLayout!: LabelElement[] | null;
+
   @CreateDateColumn()
   CreatedAt!: Date;