fix: revert ws/wss protocols - Kong OSS handles WS over http/https

Kong 3.7 OSS doesn't support ws/wss protocol identifiers (Enterprise only).
WebSocket upgrades are handled transparently over http/https protocols.

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

packages/gateway/config/kong.yml

@@ -34,8 +34,6 @@ services:
         protocols:
           - http
           - https
-          - ws
-          - wss
 
   - name: agent-config-service
     url: http://agent-service:3002
@@ -83,8 +81,6 @@ services:
         protocols:
           - http
           - https
-          - ws
-          - wss
 
   - name: voice-service
     url: http://voice-service:3008
@@ -96,8 +92,6 @@ services:
         protocols:
           - http
           - https
-          - ws
-          - wss
       - name: voice-api
         paths:
           - /api/v1/voice