chore(infra): scaffold Traefik core (static+dynamic config, compose)

infra/core/traefik/traefik.yml

@@ -0,0 +1,30 @@
+api:
+  dashboard: true
+
+providers:
+  docker:
+    exposedByDefault: false
+    network: ${TRAEFIK_NETWORK:-proxy}
+  file:
+    directory: /etc/traefik/dynamic
+    watch: true
+
+entryPoints:
+  web:
+    address: ":80"
+  websecure:
+    address: ":443"
+
+log:
+  level: ${TRAEFIK_LOG_LEVEL:-INFO}
+
+accessLog: {}
+
+certificatesResolvers:
+  letsencrypt:
+    acme:
+      email: ${ACME_EMAIL}
+      storage: /letsencrypt/acme.json
+      httpChallenge:
+        entryPoint: web
+