CHORE(app): increase CPU limits

- Prod: 400m -> 800m (2x)
- Dev: 280m -> 560m (2x)

Strategy A: Conservative approach for throttling reduction

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

@@ -16,4 +16,4 @@ spec:
               cpu: "140m"
             limits:
               memory: "161Mi"
-              cpu: "280m"
+              cpu: "560m"

deploy/k8s/overlays/dev/kustomization.yaml

@@ -14,7 +14,7 @@ commonLabels:
 # 이미지 태그 설정
 images:
   - name: ghcr.io/mayne0213/portfolio
-    newTag: develop-sha-5e7b4de60bdc6f1c3fa1404119b3550b0740e6f5
+    newTag: develop-sha-29f4196ac9055c827c043f4895fe9cfee9686f20
 
 patchesStrategicMerge:
   - deployment-patch.yaml

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

@@ -16,4 +16,4 @@ spec:
               cpu: "200m"
             limits:
               memory: "230Mi"
-              cpu: "400m"
+              cpu: "800m"