fix: use mcp-helm hardcoded port 8012 and remove invalid -port arg

mcp-helm does not support a -port flag — it always listens on 8012.
The invalid argument caused the container to crashloop.

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

chart/templates/deployment.yaml

@@ -184,7 +184,6 @@ spec:
           image: "{{ .Values.mcp.sidecars.helm.image.repository }}:{{ .Values.mcp.sidecars.helm.image.tag }}"
           args:
             - -mode=sse
-            - -port={{ .Values.mcp.sidecars.helm.port }}
           ports:
             - containerPort: {{ .Values.mcp.sidecars.helm.port }}
               name: helm-mcp

chart/values.yaml

@@ -130,7 +130,7 @@ mcp:
       image:
         repository: ghcr.io/zekker6/mcp-helm
         tag: v1.3.1
-      port: 8088
+      port: 8012
       resources:
         requests:
           memory: "64Mi"