Update wiki page 'Architecture'

Architecture.md

@@ -35,21 +35,25 @@ crates/
 
 ## Traffic Flow
 
+In production, Traefik is the entry point (shared external service). API and frontend run on separate subdomains — no internal proxy needed.
+
 ```
 User's Browser
       │
       ▼
-  Nginx (Reverse Proxy)
+  Traefik (external, shared)
-  ├── /api/* ──────────────► thoughts (API server :8000)
+  ├── api.domain.com ──────► thoughts (API server :8000)
-  │   /.well-known/*              │
-  │   /users/* (AP Accept)        └──► PostgreSQL
   │                               │
-  └── /* ──────► Next.js          NATS JetStream
+  └── domain.com ──────────► Next.js Frontend (:3000)
-                Frontend               │
+                                  │
+                            PostgreSQL   NATS JetStream
+                                              │
                                         thoughts-worker
                                    (AP delivery, notifications)
 ```
 
+In development, services are exposed directly on localhost ports — no proxy needed.
+
 ## Domain Layer
 
 `crates/domain` defines only pure types and port traits — no framework or DB dependencies: