Simplify Dockerfile to use pre-built musl binary, add Ingress

- Dockerfile: drop Rust build stage, COPY static musl binary directly
- Add traefik Ingress for tori.oci.euphon.net with LE cert

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

deploy/deployment.yaml

@@ -59,3 +59,27 @@ spec:
     - port: 80
       targetPort: 3000
   type: ClusterIP
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: tori
+  namespace: tori
+  annotations:
+    traefik.ingress.kubernetes.io/router.tls.certresolver: le
+spec:
+  ingressClassName: traefik
+  rules:
+    - host: tori.oci.euphon.net
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: tori
+                port:
+                  number: 80
+  tls:
+    - hosts:
+        - tori.oci.euphon.net