Fix K8s deployment crash: ensure DB directory exists on startup

init_db() now creates the parent directory for the SQLite database
file before connecting. Also sets HAPROXY_DB_FILE in the K8s
deployment to /app/data/ since the container doesn't have
/opt/haproxy/conf/.

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

k8s/deployment.yaml

@@ -41,6 +41,8 @@ spec:
               value: "/root/.ssh/id_rsa"
             - name: SSH_PORT
               value: "22"
+            - name: HAPROXY_DB_FILE
+              value: "/app/data/haproxy_mcp.db"
             - name: LOG_LEVEL
               value: "INFO"
           volumeMounts: