refactor: migrate from ingress-nginx to Traefik v3

Replace ingress-nginx 4.15.1 with Traefik v3 (Helm chart 39.0.7)
as the ingress controller for the local kind cluster.

- Replace k8s/nginx/ with k8s/traefik/ (Helm chart, values, namespace)
- Update setup script selectors and namespace references
- Convert nginx upstream-vhost annotations to Traefik Middleware CRDs
- Update ingressClassName from nginx to traefik

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
refactor: migrate from ingress-nginx to Traefik v3

Replace ingress-nginx 4.15.1 with Traefik v3 (Helm chart 39.0.7)
as the ingress controller for the local kind cluster.

- Replace k8s/nginx/ with k8s/traefik/ (Helm chart, values, namespace)
- Update setup script selectors and namespace references
- Convert nginx upstream-vhost annotations to Traefik Middleware CRDs
- Update ingressClassName from nginx to traefik
- Add .claude/ to .gitignore

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

k8s/infra/lavinmq.yaml

@@ -28,7 +28,7 @@ spec:
         app.kubernetes.io/name: lavinmq
     spec:
       containers:
-      - image: cloudamqp/lavinmq:2.7.0@sha256:521d49d60819a739f9323db47accb248502fca7bf79c9e0539e7b23a12e1413d
+      - image: cloudamqp/lavinmq:2.6.10@sha256:e52866d61141b3bb61a3ae99acd7fac1c750ba86af50037864f9498c27fbd89a
         imagePullPolicy: Always
         livenessProbe:
           tcpSocket:

k8s/infra/postgres.yaml

@@ -23,7 +23,6 @@ data:
     	CREATE DATABASE authz WITH OWNER postgres ENCODING utf8;
     	CREATE DATABASE company WITH OWNER postgres ENCODING utf8;
     	CREATE DATABASE consumer WITH OWNER postgres ENCODING utf8;
-    	CREATE DATABASE document WITH OWNER postgres ENCODING utf8;
     	CREATE DATABASE employee WITH OWNER postgres ENCODING utf8;
     	CREATE DATABASE invoice WITH OWNER postgres ENCODING utf8;
     	CREATE DATABASE notification WITH OWNER postgres ENCODING utf8;
@@ -53,7 +52,7 @@ spec:
     spec:
       containers:
       - name: postgres
-        image: postgres:18.3-alpine@sha256:52098013b4b64a746626437d38afc03cabff6cdeb4d3d92e2342aa95f0ce56ea
+        image: postgres:18.3-alpine@sha256:4da1a4828be12604092fa55311276f08f9224a74a62dcb4708bd7439e2a03911
         args:
         - -c
         - shared_buffers=384MB
@@ -63,6 +62,8 @@ spec:
         resources:
           requests:
             memory: 400Mi
+          limits:
+            memory: 600Mi
         ports:
         - containerPort: 5432
         env: