Add Dockerfiles and compose quickstart

.env.example

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+# Root compose defaults (safe for local self-host / dev)
+# Copy to .env to override.
+
+# --- app ports (host) ---
+FRONTEND_PORT=3000
+BACKEND_PORT=8000
+
+# --- database ---
+POSTGRES_DB=openclaw_agency
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=postgres
+POSTGRES_PORT=5432
+
+# --- redis ---
+REDIS_PORT=6379
+
+# --- backend settings (see backend/.env.example for full list) ---
+CORS_ORIGINS=http://localhost:3000
+DB_AUTO_MIGRATE=true
+
+# --- frontend settings ---
+# Public URL used by the browser to reach the API
+NEXT_PUBLIC_API_URL=http://localhost:8000