feat(helm): add per-component affinity and tolerations (#5490)

Allow scheduling backend, frontend, and postgres pods onto tainted or
labeled nodes independently via values.yaml.

deploy/helm/multica/templates/backend.yaml

@@ -104,6 +104,14 @@ spec:
             periodSeconds: 30
           resources:
             {{- toYaml .Values.backend.resources | nindent 12 }}
+      {{- with .Values.backend.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.backend.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       {{- if .Values.backend.uploads.persistence.enabled }}
       volumes:
         - name: uploads

deploy/helm/multica/templates/frontend.yaml

@@ -33,6 +33,14 @@ spec:
               value: "3000"
           resources:
             {{- toYaml .Values.frontend.resources | nindent 12 }}
+      {{- with .Values.frontend.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.frontend.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
 ---
 apiVersion: v1
 kind: Service

deploy/helm/multica/templates/postgres.yaml

@@ -77,6 +77,14 @@ spec:
             periodSeconds: 5
           resources:
             {{- toYaml .Values.postgres.resources | nindent 12 }}
+      {{- with .Values.postgres.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.postgres.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       volumes:
         - name: data
           persistentVolumeClaim:

deploy/helm/multica/values.yaml

@@ -68,6 +68,9 @@ postgres:
     limits:
       cpu: 1000m
       memory: 1Gi
+  # Standard Kubernetes scheduling constraints for the postgres Deployment.
+  affinity: {}
+  tolerations: []
 
 # -----------------------------------------------------------------------------
 # Backend (Go API + WS server)
@@ -135,6 +138,9 @@ backend:
     limits:
       cpu: 1000m
       memory: 1Gi
+  # Standard Kubernetes scheduling constraints for the backend Deployment.
+  affinity: {}
+  tolerations: []
 
 # -----------------------------------------------------------------------------
 # Frontend (Next.js standalone)
@@ -162,6 +168,9 @@ frontend:
     limits:
       cpu: 1000m
       memory: 1Gi
+  # Standard Kubernetes scheduling constraints for the frontend Deployment.
+  affinity: {}
+  tolerations: []
 
 # -----------------------------------------------------------------------------
 # Ingress