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/pdf/templates/invoice-template.ts

@@ -1,124 +0,0 @@
-import type { Template } from '@pdfme/common';
-
-import { formatCurrency } from '@/lib/utils/currency';
-
-export const invoiceTemplate: Template = {
-  basePdf: 'BLANK_PDF' as unknown as string,
-  schemas: [
-    [
-      // Header fields
-      {
-        name: 'portName',
-        type: 'text',
-        position: { x: 20, y: 15 },
-        width: 100,
-        height: 10,
-        fontSize: 16,
-      },
-      {
-        name: 'invoiceTitle',
-        type: 'text',
-        position: { x: 140, y: 15 },
-        width: 50,
-        height: 10,
-        fontSize: 16,
-      },
-      {
-        name: 'invoiceNumber',
-        type: 'text',
-        position: { x: 140, y: 27 },
-        width: 50,
-        height: 6,
-        fontSize: 10,
-      },
-      {
-        name: 'invoiceDate',
-        type: 'text',
-        position: { x: 140, y: 35 },
-        width: 50,
-        height: 6,
-        fontSize: 10,
-      },
-      {
-        name: 'dueDate',
-        type: 'text',
-        position: { x: 140, y: 43 },
-        width: 50,
-        height: 6,
-        fontSize: 10,
-      },
-      // Client info
-      {
-        name: 'clientInfo',
-        type: 'text',
-        position: { x: 20, y: 55 },
-        width: 100,
-        height: 20,
-        fontSize: 10,
-      },
-      // Line items as text block
-      {
-        name: 'lineItems',
-        type: 'text',
-        position: { x: 20, y: 85 },
-        width: 170,
-        height: 120,
-        fontSize: 9,
-      },
-      // Totals
-      {
-        name: 'totals',
-        type: 'text',
-        position: { x: 110, y: 215 },
-        width: 80,
-        height: 30,
-        fontSize: 10,
-      },
-      // Notes
-      {
-        name: 'notes',
-        type: 'text',
-        position: { x: 20, y: 250 },
-        width: 170,
-        height: 20,
-        fontSize: 8,
-      },
-    ],
-  ],
-};
-
-export function buildInvoiceInputs(
-  invoice: Record<string, unknown>,
-  lineItems: Record<string, unknown>[],
-  port: Record<string, unknown>,
-): Record<string, string> {
-  const currency = (invoice.currency as string) ?? 'USD';
-  const itemLines = lineItems
-    .map(
-      (li, i) =>
-        `${i + 1}. ${li.description}  |  Qty: ${li.quantity}  |  Unit: ${formatCurrency(Number(li.unitPrice), currency)}  |  Total: ${formatCurrency(Number(li.total), currency)}`,
-    )
-    .join('\n');
-
-  let totalsText = `Subtotal: ${formatCurrency(Number(invoice.subtotal), currency)}`;
-  if (Number(invoice.discountAmount) > 0) {
-    totalsText += `\nDiscount (${invoice.discountPct}%): -${formatCurrency(Number(invoice.discountAmount), currency)}`;
-  }
-  if (Number(invoice.feeAmount) > 0) {
-    totalsText += `\nFee (${invoice.feePct}%): +${formatCurrency(Number(invoice.feeAmount), currency)}`;
-  }
-  totalsText += `\n─────────────\nTOTAL: ${formatCurrency(Number(invoice.total), currency)}`;
-
-  return {
-    portName: (port?.name as string) ?? 'Port Nimara',
-    invoiceTitle: 'INVOICE',
-    invoiceNumber: invoice.invoiceNumber as string,
-    invoiceDate: `Date: ${new Date(invoice.createdAt as string | Date).toLocaleDateString('en-GB')}`,
-    dueDate: `Due: ${invoice.dueDate}`,
-    clientInfo:
-      `${invoice.clientName}\n${invoice.billingEmail ?? ''}\n${invoice.billingAddress ?? ''}`.trim(),
-    lineItems: itemLines || 'No line items',
-    totals: totalsText,
-    notes: invoice.notes ? `Notes: ${invoice.notes}` : '',
-  };
-}