feat: TR-069 CWMP state machine hardening + exchange viewer improvements

- TR-069 CWMP state machine hardening (14 phases): shared event utility,
  multi-event routing, GPN circuit breaker, IdleState GPN guard, expanded
  GPN fault codes, CriticalReadsState, ConfigEval GPN guard, task queue
  race condition fix, explicit error handling, terminal states
  (OperationalState/PartialOperationalState), consolidated reclassify,
  crash pattern detection, removed enqueueImmediate, state flow wiring
- Fix SOAP Fault not processed by state machine (soap-env:Fault detection)
- Fix GPN circuit breaker not persisting after session drops
- Fix CriticalReadsState GPV response parsing (xsi:type normalization)
- Fix CriticalReadsState not processing GPV response values
- Skip SPV when device is already compliant (ProvisioningCode check)
- Add Device.DeviceInfo.ModelName to critical reads GPV
- Fix TypeError on DeviceDetail parameters view (null guards)
- Log empty 204 responses in exchange trace UI
- TR-181 catalog: type corrections and new entries (+6640 lines)
- SequenceViewer: replace session-nav buttons with compact dropdown select
- SequenceViewer: fix CPE/ACS lifeline headers wrapping to 2 lines
- Add 20 unit tests for state machine fixes (SOAP Fault, GPN circuit
  breaker, CriticalReads, stale session, ConfigEval/ComplianceUpdate skips)

Generated with [Continue](https://continue.dev)

Co-Authored-By: Continue <noreply@continue.dev>

app/middleware/cwmp_logger_middleware.ts

@@ -42,10 +42,13 @@ export default class CwmpLoggerMiddleware {
     const sessionId = `${remoteIp}:${remotePort}->${localAddress}:${localPort}`
 
     let capturedResponseXml: string | null = null
+    let isEmptyResponse = false
     const originalSend = response.send.bind(response)
     response.send = (body: any) => {
       if (typeof body === 'string' && body.includes('soap-env:Envelope')) {
         capturedResponseXml = body
+      } else if (!body || (typeof body === 'string' && body.trim() === '')) {
+        isEmptyResponse = true
       }
       return originalSend(body)
     }
@@ -77,6 +80,13 @@ export default class CwmpLoggerMiddleware {
           sessionId,
           rawXml: capturedResponseXml,
         }).catch(() => {})
+      } else if (isEmptyResponse) {
+        exchangeStore.persistExchange({
+          deviceId,
+          direction: 'ACS→CPE',
+          sessionId,
+          rawXml: '',
+        }).catch(() => {})
       }
 
       // Old system: file-based writes (kept for Phase 1 dual-write rollback safety)