feat: KKT fiscal/non-fiscal mode, multi-KKT per workstation, DTO port per device

- Migration 045: fiscal_mode + dto_port columns on workstation_devices
- Backend: pass fiscal_mode/dto_port to agent in test_device command
- Agent atol.ts: remove global DTO singleton, accept dtoPort per function call
- Agent test_device: returns real KKT info (model, serial, FN, shift status)
- Equipment page: fiscal/non-fiscal toggle + DTO port field when adding KKT
- Equipment page: show fiscal mode badge on device card, DTO port if non-default
- Equipment page: KKT test result shows model, serial, FN, shift status

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

backend/migrations/045_kkt_config.sql

@@ -0,0 +1,4 @@
+-- KKT fiscal mode and DTO port per device
+ALTER TABLE workstation_devices
+  ADD COLUMN IF NOT EXISTS fiscal_mode BOOLEAN NOT NULL DEFAULT true,
+  ADD COLUMN IF NOT EXISTS dto_port    INTEGER DEFAULT 16732;