feat: complete session — catalog, marketplace, WhatsApp, peer-to-peer, install scripts

Major features:
- Pixel-Perfect glassmorphism design (landing + POS + public catalog)
- OEM/Local catalog toggle with Nexpart taxonomy (14 groups, 108 subgroups, 558 part types)
- Marketplace B2B Phase 1 (bodegas, POs, status machine, WA+email notifications)
- Peer-to-peer inventory (multi-instance, LAN discovery)
- WhatsApp: photo→Vision AI, voice→Whisper, conversational quotations
- Smart unified search (VIN/plate/part_number/keyword auto-detect)
- Shop Supplies tab (vehicle-independent parts)
- Chatbot AI fallback chain (5 models) + response cache
- CSV inventory import tool + setup_instance.sh installer
- Tablet-responsive CSS + sidebar toggle
- Filters, export CSV, employee edit, business data save
- Quotation system (WA→POS) with auto-print on confirmation
- Live stats on landing page

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pos/services/thermal_printer.py

@@ -105,6 +105,93 @@ def generate_ticket(sale_data, business_info, width=80):
     return bytes(buf)
 
 
+def generate_quotation_ticket(quote_data, business_info, width=80):
+    """Generate ESC/POS bytes for a quotation ticket.
+
+    Args:
+        quote_data: dict with keys: id, items[{name, part_number, quantity, unit_price, subtotal}],
+                    subtotal, tax_total, total, valid_until, customer_name, wa_phone, created_at
+        business_info: dict with name, rfc, address
+        width: 58 or 80 (mm)
+
+    Returns: bytes ready to send to printer
+    """
+    chars = 32 if width == 58 else 48
+    buf = bytearray()
+    buf += INIT
+
+    # Header
+    buf += ALIGN_CENTER
+    buf += LARGE_SIZE
+    buf += (business_info.get('name', 'NEXUS POS') + '\n').encode('cp437', errors='replace')
+    buf += NORMAL_SIZE
+    if business_info.get('rfc'):
+        buf += (business_info['rfc'] + '\n').encode('cp437', errors='replace')
+    if business_info.get('address'):
+        buf += (business_info['address'] + '\n').encode('cp437', errors='replace')
+    buf += b'\n'
+
+    # Title
+    buf += BOLD_ON + DOUBLE_HEIGHT
+    buf += 'COTIZACION\n'.encode('cp437', errors='replace')
+    buf += NORMAL_SIZE + BOLD_OFF
+    buf += b'\n'
+
+    # Folio + date
+    buf += ALIGN_LEFT
+    buf += BOLD_ON
+    buf += f'Folio: COT-{quote_data.get("id", "")}\n'.encode('cp437', errors='replace')
+    buf += BOLD_OFF
+    buf += f'Fecha: {str(quote_data.get("created_at", ""))[:10]}\n'.encode('cp437', errors='replace')
+    buf += f'Vigencia: {quote_data.get("valid_until", "7 dias")}\n'.encode('cp437', errors='replace')
+    if quote_data.get('customer_name'):
+        buf += f'Cliente: {quote_data["customer_name"]}\n'.encode('cp437', errors='replace')
+    if quote_data.get('wa_phone'):
+        buf += f'WhatsApp: {quote_data["wa_phone"]}\n'.encode('cp437', errors='replace')
+    buf += ('-' * chars + '\n').encode()
+
+    # Column header
+    buf += BOLD_ON
+    hdr = _format_line('Cant  Descripcion', 'Importe', chars)
+    buf += (hdr + '\n').encode('cp437', errors='replace')
+    buf += BOLD_OFF
+    buf += ('-' * chars + '\n').encode()
+
+    # Items
+    for item in quote_data.get('items', []):
+        name = item.get('name', '')[:chars - 10]
+        part_no = item.get('part_number', '')
+        qty = item.get('quantity', 1)
+        subtotal = item.get('subtotal', 0)
+        buf += f'{qty}x {name}\n'.encode('cp437', errors='replace')
+        if part_no:
+            buf += f'   #{part_no}\n'.encode('cp437', errors='replace')
+        buf += ALIGN_RIGHT
+        buf += f'${subtotal:,.2f}\n'.encode('cp437', errors='replace')
+        buf += ALIGN_LEFT
+
+    buf += ('-' * chars + '\n').encode()
+
+    # Totals
+    buf += ALIGN_RIGHT
+    buf += _total_line('Subtotal:', quote_data.get('subtotal', 0), chars).encode('cp437', errors='replace')
+    buf += _total_line('IVA:', quote_data.get('tax_total', 0), chars).encode('cp437', errors='replace')
+    buf += BOLD_ON + DOUBLE_HEIGHT
+    buf += _total_line('TOTAL:', quote_data.get('total', 0), chars).encode('cp437', errors='replace')
+    buf += NORMAL_SIZE + BOLD_OFF
+
+    # Footer
+    buf += b'\n'
+    buf += ALIGN_CENTER
+    buf += 'Esta cotizacion no es comprobante fiscal\n'.encode('cp437', errors='replace')
+    buf += 'Precios sujetos a disponibilidad\n'.encode('cp437', errors='replace')
+    buf += 'Nexus Autoparts POS\n'.encode('cp437', errors='replace')
+    buf += b'\n\n\n'
+    buf += PARTIAL_CUT
+
+    return bytes(buf)
+
+
 def _format_line(left, right, width):
     """Pad a left-right line to fill the ticket width."""
     space = width - len(left) - len(right)