Add backend transport timeouts and Mailcow-specific transport

Configure default server transport with connection timeouts and add insecure transport for Mailcow backend with self-signed certificates.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.gitignore

@@ -1,2 +1,3 @@
 .env
 acme.json
+logs

traefik.yml

@@ -14,6 +14,11 @@ entryPoints:
           scheme: https
   websecure:
     address: ":443"
+    transport:
+      respondingTimeouts:
+        readTimeout: "0" # Illimité pour uploads
+        writeTimeout: "0" # Illimité pour responses
+        idleTimeout: 180s # 3 minutes idle
 
 certificatesResolvers:
   letsencrypt:
@@ -30,3 +35,13 @@ providers:
   file:
     filename: /etc/traefik/dynamic.yml
     watch: true
+
+serversTransport:
+  forwardingTimeouts:
+    dialTimeout: 30s
+    responseHeaderTimeout: 0s
+    idleConnTimeout: 3600s
+
+serversTransports:
+  mailcow-transport:
+    insecureSkipVerify: true