fix: playwright MCP sidecar bind to 0.0.0.0 for probe access (#42)

The Playwright MCP server binds to 127.0.0.1 by default, which makes
it unreachable by Kubernetes liveness/readiness probes from the kubelet.
Add --host 0.0.0.0 to bind to all interfaces.

Fixes #42

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

chart/Chart.yaml

@@ -2,5 +2,5 @@ apiVersion: v2
 name: devcontainer
 description: Dev Container with AI coding agents and MCP sidecars
 type: application
-version: 0.4.2
+version: 0.4.3
 appVersion: "latest"

chart/templates/deployment.yaml

@@ -245,6 +245,8 @@ spec:
             - --browser
             - chromium
             - --no-sandbox
+            - --host
+            - 0.0.0.0
             - --port
             - {{ .Values.mcp.sidecars.playwright.port | quote }}
           ports: