fix(traefik): Add host rewriting for email autoconfig endpoints

Django's multi-tenant middleware doesn't recognize autoconfig/autodiscover
subdomains. This middleware rewrites the Host header to api.smoothschedule.com
so Django routes the request to the public schema.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

smoothschedule/compose/production/traefik/traefik.yml

@@ -64,10 +64,13 @@ http:
         certResolver: letsencrypt
 
     # Email autoconfiguration subdomains
+    # These need host rewriting because Django's tenant middleware doesn't recognize them
     autoconfig-router:
       rule: 'Host(`autoconfig.smoothschedule.com`)'
       entryPoints:
         - web-secure
+      middlewares:
+        - email-autoconfig-host
       service: django
       tls:
         certResolver: letsencrypt
@@ -76,6 +79,8 @@ http:
       rule: 'Host(`autodiscover.smoothschedule.com`)'
       entryPoints:
         - web-secure
+      middlewares:
+        - email-autoconfig-host
       service: django
       tls:
         certResolver: letsencrypt
@@ -107,6 +112,12 @@ http:
       headers:
         hostsProxyHeaders: ['X-CSRFToken']
 
+    email-autoconfig-host:
+      # Rewrite Host header so Django tenant middleware routes to API/public schema
+      headers:
+        customRequestHeaders:
+          Host: 'api.smoothschedule.com'
+
   services:
     django:
       loadBalancer: