feat: setup pdf on the central billing

apps/edr-freight-api/src/modules/billing/billing.service.ts

@@ -221,19 +221,33 @@ export class BillingService {
     }
   }
 
-  /** Every invoice billed to a company, newest first, with billing relations. */
-  findByCompany(companyId: string): Promise<Invoice[]> {
+  /**
+   * Every invoice billed to a company, newest first, with billing relations.
+   * Optionally narrow to a single source record (e.g. a booking's invoices) via
+   * `{ source, sourceId }`.
+   */
+  findByCompany(
+    companyId: string,
+    filter: { source?: string; sourceId?: string } = {},
+  ): Promise<Invoice[]> {
     return this.invoices.findAll({
-      where: { companyId },
+      where: {
+        companyId,
+        ...(filter.source ? { source: filter.source } : {}),
+        ...(filter.sourceId ? { sourceId: filter.sourceId } : {}),
+      },
       relations: { company: true, companyProfile: true },
       order: { createdAt: "DESC" },
     });
   }
 
   /** Invoices for the signed-in customer; empty when they have no company. */
-  async findForUser(userId: string): Promise<Invoice[]> {
+  async findForUser(
+    userId: string,
+    filter: { source?: string; sourceId?: string } = {},
+  ): Promise<Invoice[]> {
     const companyId = await this.resolveCompanyId(userId);
-    return companyId ? this.findByCompany(companyId) : [];
+    return companyId ? this.findByCompany(companyId, filter) : [];
   }
 
   /** Company-scoped invoice detail (+ lines); 404 when not owned by the user. */
@@ -267,6 +281,24 @@ export class BillingService {
     );
   }
 
+  /** Sealed invoice PDF for one of the customer's own invoices (ownership-checked). */
+  async documentForUser(
+    id: string,
+    userId: string,
+  ): Promise<{ filename: string; buffer: Buffer }> {
+    await this.findByIdForUser(id, userId);
+    return this.document(id);
+  }
+
+  /** Sealed receipt PDF for one of the customer's own invoices (ownership-checked). */
+  async receiptForUser(
+    id: string,
+    userId: string,
+  ): Promise<{ filename: string; buffer: Buffer }> {
+    await this.findByIdForUser(id, userId);
+    return this.receipt(id);
+  }
+
   // ── Generation ───────────────────────────────────────────────────────────────
 
   /** `<CODE>-YYYYMMDD-00001` — sequential per day & prefix, within the active transaction. */