feat: printer duplicate copies setting (Feature 1)

- Add `duplicates` column (0-9) to printers table via migration
- Print loop repeats job 1+duplicates times per printer zone
- PrinterForm in Settings > Print now has ΑΝΤΙΓΡΑΦΑ (0-9) field
- PrinterRow shows amber badge when duplicates > 0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

local_backend/main.py

@@ -406,6 +406,8 @@ def _run_migrations():
             created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
             priority VARCHAR NOT NULL DEFAULT 'normal'
         )""",
+        # Printer duplicate copies (0 = print once, 1 = print twice, etc.)
+        "ALTER TABLE printers ADD COLUMN duplicates INTEGER NOT NULL DEFAULT 0",
     ]
     for sql in migrations:
         try:

local_backend/models/printer.py

@@ -13,6 +13,7 @@ class Printer(Base):
     is_active = Column(Boolean, default=True, nullable=False)
     protocol = Column(String, default="escpos_tcp", nullable=False)
     line_width = Column(Integer, default=48, nullable=False)
+    duplicates = Column(Integer, default=0, nullable=False)
 
     products = relationship("Product", back_populates="printer_zone")
     print_logs = relationship("PrintLog", back_populates="printer")

local_backend/schemas/printer.py

@@ -12,6 +12,7 @@ class PrinterBase(BaseModel):
     is_active: bool = True
     protocol: str = "escpos_tcp"
     line_width: int = 48
+    duplicates: int = 0
 
 
 class PrinterCreate(PrinterBase):
@@ -25,6 +26,7 @@ class PrinterUpdate(BaseModel):
     is_active: Optional[bool] = None
     protocol: Optional[str] = None
     line_width: Optional[int] = None
+    duplicates: Optional[int] = None
 
 
 class PrinterOut(PrinterBase):

local_backend/services/printer_service.py

@@ -1256,7 +1256,9 @@ def _do_route_and_print(order_id: int, item_ids: List[int], db: Session) -> List
 
         success = False
         error_msg = None
+        copies = 1 + max(0, printer.duplicates or 0)
         try:
+            for _ in range(copies):
                 p = _get_printer(printer.ip_address, printer.port)
                 _print_kitchen_ticket(p, order, zone_items, db, printer.line_width)
                 p.close()

manager_dashboard/src/pages/Settings/tabs/PrintFontsTab.jsx

@@ -637,7 +637,7 @@ function BeepSection({ beepEnabled, beepPattern, onChange, isPending, printers }
 // ── Printers section ───────────────────────────────────────────────────────
 
 const PROTOCOLS = [{ value: 'escpos_tcp', label: 'ESC/POS TCP (standard)' }]
-const EMPTY_FORM = { name: '', ip_address: '', port: 9100, protocol: 'escpos_tcp', line_width: 48, is_active: true }
+const EMPTY_FORM = { name: '', ip_address: '', port: 9100, protocol: 'escpos_tcp', line_width: 48, is_active: true, duplicates: 0 }
 
 function PrinterForm({ initial, onSave, onCancel, isPending }) {
   const [form, setForm] = useState(initial ?? EMPTY_FORM)
@@ -674,6 +674,11 @@ function PrinterForm({ initial, onSave, onCancel, isPending }) {
         <input value={form.line_width} onChange={e => set('line_width', parseInt(e.target.value) || 48)}
           type="number" min={20} max={80} style={inputStyle} />
       </div>
+      <div style={{ display: 'flex', flexDirection: 'column', gap: 4, flex: '0 0 90px' }}>
+        <label style={{ fontSize: 11, fontWeight: 600, color: '#6b7280' }}>ΑΝΤΙΓΡΑΦΑ</label>
+        <input value={form.duplicates ?? 0} onChange={e => set('duplicates', Math.max(0, Math.min(9, parseInt(e.target.value) || 0)))}
+          type="number" min={0} max={9} style={inputStyle} title="0 = μία εκτύπωση, 1 = δύο κ.ο.κ." />
+      </div>
       <div style={{ display: 'flex', gap: 8, alignItems: 'center', paddingBottom: 2 }}>
         <button onClick={() => onSave(form)} disabled={isPending || !form.name.trim() || !form.ip_address.trim()}
           style={btnPrimary}>Αποθήκευση</button>
@@ -739,6 +744,11 @@ function PrinterRow({ printer, onEdit, onDelete, onTest, onToggle, testPending }
         </span>
         <span style={{ fontSize: 11, color: '#9ca3af', marginLeft: 6 }}>— {printer.protocol}</span>
         <span style={{ fontSize: 11, color: '#9ca3af', marginLeft: 6 }}>— {printer.line_width ?? 48} χαρ.</span>
+        {(printer.duplicates ?? 0) > 0 && (
+          <span style={{ fontSize: 11, color: '#f59e0b', fontWeight: 700, marginLeft: 6 }}>
+            — x{(printer.duplicates ?? 0) + 1} αντ.
+          </span>
+        )}
       </div>
 
       <span style={{