feat: add Docker Compose production stack with Traefik + Logto

7-service stack: Traefik (reverse proxy), PostgreSQL (shared),
Logto (identity), cameleer-saas (control plane), cameleer3-server
(observability), ClickHouse (traces). ForwardAuth middleware for
tenant-aware routing to cameleer3-server.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.dev.yml

@@ -0,0 +1,21 @@
+# Development overrides: exposes ports for direct access
+# Usage: docker compose -f docker-compose.yml -f docker-compose.dev.yml up
+services:
+  postgres:
+    ports:
+      - "5432:5432"
+
+  logto:
+    ports:
+      - "3001:3001"
+      - "3002:3002"
+
+  cameleer-saas:
+    ports:
+      - "8080:8080"
+    environment:
+      SPRING_PROFILES_ACTIVE: dev
+
+  clickhouse:
+    ports:
+      - "8123:8123"