feat: early check-in / late checkout fees with room-level configuration

- DB migration 016: add early_checkin_fee, late_checkout_fee to rooms table
- Backend rooms: support new fee columns in POST/PATCH
- Backend hotel-settings GET: also returns check_in_time, check_out_time
- Room type + RoomPayload: add earlyCheckinFee, lateCheckoutFee fields
- RoomModal: add fee amount inputs in pricing section
- SettingsPage: add toggles for early_checkin_enabled / late_checkout_enabled
- BookingDetailPanel: on check-in shows fee warning + adds payment record if
  current time is before checkInTime and fee is set on the room; same logic
  for check-out after checkOutTime

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

src/components/rooms/RoomModal.tsx

@@ -72,6 +72,8 @@ export function RoomModal({ open, room, categories = [], onClose, onSave, onDele
     hourlyRate:         room?.hourlyRate         ?? 1000,
     categoryId:         room?.categoryId         ?? '',
     description:        room?.description        ?? '',
+    earlyCheckinFee:    room?.earlyCheckinFee    ?? '',
+    lateCheckoutFee:    room?.lateCheckoutFee    ?? '',
   })
 
   const { amenities: allAmenities } = useAmenities()
@@ -148,6 +150,8 @@ export function RoomModal({ open, room, categories = [], onClose, onSave, onDele
       beds:               beds.length > 0 ? beds : undefined,
       extraPlace:         extraPlace.enabled ? extraPlace : undefined,
       childPolicy:        childPolicy.enabled ? childPolicy : undefined,
+      earlyCheckinFee:    form.earlyCheckinFee !== '' ? Number(form.earlyCheckinFee) : undefined,
+      lateCheckoutFee:    form.lateCheckoutFee !== '' ? Number(form.lateCheckoutFee) : undefined,
     })
   }
 
@@ -303,6 +307,34 @@ export function RoomModal({ open, room, categories = [], onClose, onSave, onDele
             )}
           </div>
 
+          {/* Early check-in / late checkout fees */}
+          <div className="rounded-xl border border-slate-200 dark:border-slate-700 overflow-hidden">
+            <div className="px-4 py-3 bg-slate-50 dark:bg-slate-700/40 border-b border-slate-200 dark:border-slate-700">
+              <p className="text-sm font-medium text-slate-700 dark:text-slate-300">Тарифы за ранний/поздний заезд</p>
+              <p className="text-xs text-slate-500 dark:text-slate-400 mt-0.5">Применяются если включено в настройках отеля</p>
+            </div>
+            <div className="p-4 grid grid-cols-2 gap-3">
+              <div>
+                <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-1.5">Ранний заезд ₽</label>
+                <input
+                  type="number" min={0} className="input"
+                  placeholder="0 = бесплатно"
+                  value={form.earlyCheckinFee}
+                  onChange={e => set('earlyCheckinFee', e.target.value)}
+                />
+              </div>
+              <div>
+                <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-1.5">Поздний выезд ₽</label>
+                <input
+                  type="number" min={0} className="input"
+                  placeholder="0 = бесплатно"
+                  value={form.lateCheckoutFee}
+                  onChange={e => set('lateCheckoutFee', e.target.value)}
+                />
+              </div>
+            </div>
+          </div>
+
           {/* Amenities */}
           <div>
             <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-2">Удобства</label>