CHORE(app): reduce resource limits

- CPU limit: 800m → 100m (prod), 560m → 80m (dev)
- Memory limit: 230Mi → 150Mi (prod), 161Mi → 120Mi (dev)
- ResourceQuota adjusted accordingly

Actual usage: ~8m CPU, ~111Mi memory

deploy/k8s/overlays/dev/resourcequota.yaml

@@ -5,8 +5,8 @@ metadata:
   namespace: portfolio-dev
 spec:
   hard:
-    requests.memory: "525Mi"
-    requests.cpu: "840m"
-    limits.memory: "840Mi"
-    limits.cpu: "1680m"
+    requests.memory: "200Mi"
+    requests.cpu: "100m"
+    limits.memory: "400Mi"
+    limits.cpu: "200m"
     pods: "6"