REFACTOR(app): migrate to argocd

- Add Kustomize base and prod overlay structure
- Optimize resources for 2GB RAM environment (100Mi/200Mi)
- Add ArgoCD Application manifest
- Remove old k8s manifests (replaced by Kustomize)
- Add comprehensive deployment guide

deploy/k8s/overlays/prod/deployment-patch.yaml

@@ -0,0 +1,19 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: jovies-app
+  labels:
+    environment: production
+spec:
+  replicas: 1
+  template:
+    spec:
+      containers:
+        - name: jovies-app
+          resources:
+            requests:
+              memory: "100Mi"
+              cpu: "50m"
+            limits:
+              memory: "200Mi"
+              cpu: "150m"