feat: configurable DTO login/password per KKT device

- Equipment page: add login/password fields in KKT fiscal mode form
- Stored in device config JSON (dto_user, dto_pass)
- Backend passes credentials to agent in test_device command
- Agent uses per-device credentials for all ATOL DTO API calls

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

backend/src/routes/workstations.ts

@@ -300,6 +300,8 @@ const workstationRoutes: FastifyPluginAsync = async (fastify) => {
             com_port: device.com_port,
             fiscal_mode: device.fiscal_mode,
             dto_port: device.dto_port,
+            dto_user: device.config?.dto_user,
+            dto_pass: device.config?.dto_pass,
           },
         }) as { ok: boolean; error?: string; message?: string }
         return result

src/pages/EquipmentPage.tsx

@@ -201,6 +201,8 @@ function DeviceForm({
   const [purpose, setPurpose]         = useState(initial?.purpose ?? 'receipt')
   const [fiscalMode, setFiscalMode]   = useState(initial?.fiscalMode !== false)
   const [dtoPort, setDtoPort]         = useState(String(initial?.dtoPort ?? 16732))
+  const [dtoUser, setDtoUser]         = useState(String(initial?.config?.dto_user ?? '30'))
+  const [dtoPass, setDtoPass]         = useState(String(initial?.config?.dto_pass ?? '30'))
   const [saving, setSaving]           = useState(false)
   const [availablePorts, setAvailablePorts] = useState<{ port: string; description?: string }[] | null>(null)
   const [portsLoading, setPortsLoading]     = useState(false)
@@ -228,6 +230,7 @@ function DeviceForm({
       purpose: purpose as WorkstationDevice['purpose'],
       fiscalMode: type === 'kkt' ? fiscalMode : undefined,
       dtoPort:    type === 'kkt' && fiscalMode ? Number(dtoPort) : undefined,
+      config:     type === 'kkt' && fiscalMode ? { dto_user: dtoUser, dto_pass: dtoPass } : undefined,
     })
     setSaving(false)
   }
@@ -291,15 +294,38 @@ function DeviceForm({
             </div>
           </div>
           {fiscalMode && (
-            <div>
-              <label className="block text-xs font-medium text-slate-500 mb-1">Порт АТОЛ ДТО</label>
-              <input
-                value={dtoPort}
-                onChange={e => setDtoPort(e.target.value)}
-                className="w-32 input text-sm font-mono"
-                placeholder="16732"
-              />
-              <p className="text-xs text-slate-400 mt-1">Порт АТОЛ ДТО 10 (по умолчанию 16732). Для нескольких касс — разные порты.</p>
+            <div className="space-y-3">
+              <div>
+                <label className="block text-xs font-medium text-slate-500 mb-1">Порт АТОЛ ДТО</label>
+                <input
+                  value={dtoPort}
+                  onChange={e => setDtoPort(e.target.value)}
+                  className="w-32 input text-sm font-mono"
+                  placeholder="16732"
+                />
+                <p className="text-xs text-slate-400 mt-1">По умолчанию 16732. Для нескольких касс — разные порты.</p>
+              </div>
+              <div className="grid grid-cols-2 gap-3">
+                <div>
+                  <label className="block text-xs font-medium text-slate-500 mb-1">Логин ДТО</label>
+                  <input
+                    value={dtoUser}
+                    onChange={e => setDtoUser(e.target.value)}
+                    className="w-full input text-sm"
+                    placeholder="30"
+                  />
+                </div>
+                <div>
+                  <label className="block text-xs font-medium text-slate-500 mb-1">Пароль ДТО</label>
+                  <input
+                    type="password"
+                    value={dtoPass}
+                    onChange={e => setDtoPass(e.target.value)}
+                    className="w-full input text-sm"
+                    placeholder="30"
+                  />
+                </div>
+              </div>
             </div>
           )}
         </div>