feat: add harmonic-wordpress dev environment on Legion

- Add harmonic-wordpress namespace
- WordPress + MySQL deployment with PVCs and ExternalSecrets
- Ingress for dev.harmonic-framework.com via Traefik + cert-manager
- Argo CD Application watching k8s/harmonic-wordpress/
- Add public Gitea repo credential for git.neuralplatform.ai

servers/legion/k8s/harmonic-wordpress/external-secrets.yaml

@@ -0,0 +1,22 @@
+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: wordpress-db
+  namespace: harmonic-wordpress
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    name: vault
+    kind: ClusterSecretStore
+  target:
+    name: wordpress-db
+    creationPolicy: Owner
+  data:
+    - secretKey: mysql_root_password
+      remoteRef:
+        key: secret/data/harmonic-wordpress
+        property: mysql_root_password
+    - secretKey: mysql_password
+      remoteRef:
+        key: secret/data/harmonic-wordpress
+        property: mysql_password