Add manual invoice creation mode with new API & UI flow

Introduced "ModeB" for manual invoice creation in system config. Added backend endpoints and service logic for creating invoices from confirmed Shop POs, with validation and error handling. Updated DTOs to support optional CreatedByUserId. On the frontend, added configuration card to toggle modes, a dialog for manual invoice creation, and UI updates to support the new workflow. Enables admins to choose between automatic and manual invoice creation.

distribution_fe/lib/api/sales.ts

@@ -48,6 +48,9 @@ export const shopPos = {
   get: (id: string) =>
     api.get<ShopPOResponse>(`/shop-pos/${id}`).then(r => r.data),
 
+  confirmedWithoutInvoice: (params?: { agentId?: string; routeId?: string; shopId?: string }) =>
+    api.get<ShopPOResponse[]>('/shop-pos/confirmed-without-invoice', { params }).then(r => r.data),
+
   create: (body: CreateShopPOBody) =>
     api.post<ShopPOResponse>('/shop-pos', body).then(r => r.data),
 
@@ -84,6 +87,9 @@ export const invoices = {
   get: (id: string) =>
     api.get<InvoiceResponse>(`/invoices/${id}`).then(r => r.data),
 
+  create: (shopPOId: string, createdByUserId?: string | null) =>
+    api.post<InvoiceResponse>('/invoices', { shopPOId, createdByUserId }).then(r => r.data),
+
   print: (id: string, printedByUserId?: string | null) =>
     api.post<InvoiceResponse>(`/invoices/${id}/print`, { printedByUserId }).then(r => r.data),