feat(invoices): remove client-facing PDF generation

Phase 1 / commit 11 of 14 — invoices are client-facing documents, and
per the new "no CRM-generated client-facing PDFs" rule (see the design
spec), the in-app pdfme rendering is removed entirely.

Future invoice rendering will use the deferred AcroForm-fill admin-
template feature: admin uploads a PDF template with named form fields,
CRM fills them with invoice data via pdf-lib. Same pattern as the
in-app EOI pathway. Tracked in BACKLOG.md.

Deleted:
  - src/lib/services/invoices.ts:generateInvoicePdf (60 LOC)
  - src/lib/pdf/templates/invoice-template.ts (entire pdfme template)
  - src/app/api/v1/invoices/[id]/generate-pdf/route.ts
  - src/components/invoices/invoice-pdf-preview.tsx (regenerate UI)
  - "PDF Preview" tab on invoice detail page
  - 5 now-unused imports in invoices.ts (files, ports, buildStoragePath,
    getStorageBackend, env)

sendInvoice() retained: still queues the send-invoice email job, still
flips status to "sent", still emits the socket event. The PDF-attach
step is gone — downstream consumers either render externally or wait
for the AcroForm-fill feature. The `pdfFileId` column on invoices stays
so existing rows don't break, just never gets written by this code path.

1319/1319 vitest green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/services/invoices.ts

@@ -3,8 +3,6 @@ import type { PgColumn } from 'drizzle-orm/pg-core';
 
 import { db } from '@/lib/db';
 import { invoices, invoiceLineItems, invoiceExpenses, expenses } from '@/lib/db/schema/financial';
-import { files } from '@/lib/db/schema/documents';
-import { ports } from '@/lib/db/schema/ports';
 import { systemSettings } from '@/lib/db/schema/system';
 import { clients, clientAddresses } from '@/lib/db/schema/clients';
 import { companies, companyAddresses } from '@/lib/db/schema/companies';
@@ -17,12 +15,7 @@ import { getCountryName } from '@/lib/i18n/countries';
 import { getSubdivisionName } from '@/lib/i18n/subdivisions';
 import { emitToRoom } from '@/lib/socket/server';
 import { logger } from '@/lib/logger';
-import { generatePdf } from '@/lib/pdf/generate';
-import { invoiceTemplate, buildInvoiceInputs } from '@/lib/pdf/templates/invoice-template';
-import { buildStoragePath } from '@/lib/minio';
-import { getStorageBackend } from '@/lib/storage';
 import { getQueue } from '@/lib/queue';
-import { env } from '@/lib/env';
 import type {
   CreateInvoiceInput,
   UpdateInvoiceInput,
@@ -588,83 +581,17 @@ export async function deleteInvoice(id: string, portId: string, meta: AuditMeta)
   });
 }
 
-// ─── Generate PDF ─────────────────────────────────────────────────────────
-
-export async function generateInvoicePdf(id: string, portId: string, meta: AuditMeta) {
-  const invoice = await getInvoiceById(id, portId);
-
-  const [port] = await db
-    .select({ id: ports.id, name: ports.name, slug: ports.slug })
-    .from(ports)
-    .where(eq(ports.id, portId))
-    .limit(1);
-
-  const inputs = buildInvoiceInputs(invoice, invoice.lineItems, port ?? {});
-
-  const pdfBytes = await generatePdf(invoiceTemplate, [inputs]);
-
-  const fileId = crypto.randomUUID();
-  const storagePath = buildStoragePath(port?.slug ?? portId, 'invoices', id, fileId, 'pdf');
-
-  const buffer = Buffer.from(pdfBytes);
-  const backend = await getStorageBackend();
-  await backend.put(storagePath, buffer, {
-    contentType: 'application/pdf',
-    sizeBytes: buffer.length,
-  });
-
-  const [fileRecord] = await db
-    .insert(files)
-    .values({
-      portId,
-      filename: `invoice-${invoice.invoiceNumber}.pdf`,
-      originalName: `invoice-${invoice.invoiceNumber}.pdf`,
-      mimeType: 'application/pdf',
-      sizeBytes: String(pdfBytes.length),
-      storagePath,
-      storageBucket: env.MINIO_BUCKET,
-      category: 'invoice',
-      uploadedBy: meta.userId,
-    })
-    .returning();
-
-  if (!fileRecord)
-    throw new CodedError('INSERT_RETURNING_EMPTY', {
-      internalMessage: 'Invoice PDF file record insert returned no row',
-    });
-
-  await db
-    .update(invoices)
-    .set({ pdfFileId: fileRecord.id, updatedAt: new Date() })
-    .where(and(eq(invoices.id, id), eq(invoices.portId, portId)));
-
-  void createAuditLog({
-    userId: meta.userId,
-    portId,
-    action: 'update',
-    entityType: 'invoice',
-    entityId: id,
-    metadata: { action: 'pdf_generated', fileId: fileRecord.id },
-    ipAddress: meta.ipAddress,
-    userAgent: meta.userAgent,
-  });
-
-  return fileRecord;
-}
-
 // ─── Send invoice ─────────────────────────────────────────────────────────
 
 export async function sendInvoice(id: string, portId: string, meta: AuditMeta) {
   const invoice = await getInvoiceById(id, portId);
 
-  // Generate PDF if not exists
-  let pdfFileId = invoice.pdfFileId;
-  if (!pdfFileId) {
-    const fileRecord = await generateInvoicePdf(id, portId, meta);
-    pdfFileId = fileRecord.id;
-  }
-
-  // Queue email job
+  // Invoice PDF generation has been removed (the CRM no longer renders
+  // client-facing PDFs from scratch — see the PDF stack overhaul spec).
+  // The "send" event still fires so the queue + audit + socket flow
+  // remains intact; downstream consumers can decide whether to render
+  // an external document, link to the in-app view, or wait for the
+  // admin-uploaded AcroForm-fill feature to ship.
   await getQueue('email').add('send-invoice', { invoiceId: id, portId });
 
   // Update status to 'sent'