feat: TTLock diagnostics — test cloud API button + fix api_server SELECT bug

- Fix: api_server was missing from SELECT in issue-card route (always fell back to EU default)
- Add "Проверить API" button in Step 1 that calls ttlock:test_api via agent
- Agent: testCloudApi() — gets OAuth token + lists locks, returns count
- Agent: apiPost() now includes response body in error message (was just HTTP status)

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

src/lib/api.ts

@@ -616,6 +616,9 @@ export const api = {
     testEncoder: (slug: string, workstationId: string) =>
       req<{ ok: boolean }>('POST', `/api/hotels/${slug}/ttlock/test`, { workstationId }),
 
+    testApi: (slug: string, workstationId: string) =>
+      req<{ ok: boolean; lockCount?: number }>('POST', `/api/hotels/${slug}/ttlock/test-api`, { workstation_id: workstationId }),
+
     dllInfo: (slug: string, workstationId: string) =>
       req<{ ok: boolean; content: string; path: string }>('GET', `/api/hotels/${slug}/ttlock/dll-info?workstation_id=${workstationId}`),