fix: use TCP probes instead of HTTP for MCP endpoint

MCP endpoints return 406 for plain GET requests since they use SSE.
TCP socket probes check if the port is open without protocol issues.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

k8s/deployment.yaml

@@ -39,14 +39,12 @@ spec:
               memory: "256Mi"
               cpu: "500m"
           livenessProbe:
-            httpGet:
+            tcpSocket:
-              path: /mcp
               port: 5000
             initialDelaySeconds: 10
             periodSeconds: 30
           readinessProbe:
-            httpGet:
+            tcpSocket:
-              path: /mcp
               port: 5000
             initialDelaySeconds: 5
             periodSeconds: 10