fix(telephony): stop ARI WebSocket false-abort loop (pong-timeout 15s->3600s)

Asterisk res_http_websocket does not reliably answer client PING frames
with PONG, so .NET KeepAliveTimeout (default 15s) aborted a healthy idle
ARI WebSocket every ~45s (ping@30s + pong-wait@15s), dropping StasisStart
events so the *100 IVR intermittently answered with no audio. Generous pong
timeout stops the false aborts; genuine drops still caught by the 45s
receive-timeout state re-check and TCP-level WebSocketException.

Surfaced by FlowerCore.Telephony.SipTests Call_Star100_ReceivesAudibleAudioStream
(0 RTP packets while ExtToExt RTP-hook passed).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/telephony/telephony.yaml

@@ -62,7 +62,10 @@ data:
         "Password": "bluejay-asterisk-ari",
         "Application": "flowercore-pbx",
         "ReconnectDelaySeconds": 5,
-        "MaxReconnectDelaySeconds": 60
+        "MaxReconnectDelaySeconds": 60,
+        "WebSocketKeepAliveIntervalSeconds": 30,
+        "WebSocketKeepAliveTimeoutSeconds": 3600,
+        "WebSocketReceiveTimeoutSeconds": 45
       },
       "Sip": {
         "Domain": "10.0.56.207",
@@ -114,9 +117,9 @@ spec:
       app: telephony-web
   template:
     metadata:
-      annotations:
+      annotations:
-        fc.flowercore.io/healthz-anon: "true"
+        fc.flowercore.io/healthz-anon: "true"
-        fc.flowercore.io/probe-path: "/health"
+        fc.flowercore.io/probe-path: "/health"
       labels:
         app: telephony-web
     spec:
@@ -164,7 +167,7 @@ spec:
           ports:
             - containerPort: 5100
               name: http
-          # fc-safe-to-expose: X-Forwarded-Proto handled by AddFlowerCoreWebAuth (ADR-178) before any future public/OIDC flip.
+          # fc-safe-to-expose: X-Forwarded-Proto handled by AddFlowerCoreWebAuth (ADR-178) before any future public/OIDC flip.
           env:
             - name: Telephony__Twilio__AccountSid
               valueFrom: