Initial commit: Matrix stack (Synapse + Synapse-Admin + Element Web) behind Traefik

Fully dockerized deployment with automatic Let's Encrypt certificates via
Traefik's static file provider (no docker.sock needed), bind-mounted data
folders instead of named volumes, and domain/secrets kept out of git via
.env + rendered templates.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

wellknown/nginx.conf

@@ -0,0 +1,15 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+
+    location = /.well-known/matrix/client {
+        default_type application/json;
+        add_header Access-Control-Allow-Origin * always;
+        try_files /well-known-matrix-client.json =404;
+    }
+
+    location / {
+        return 404;
+    }
+}