feat(deploy): add Railway deployment configuration and setup instructions

deploy/railway/railway.toml

@@ -0,0 +1,18 @@
+# railway.toml
+[build]
+builder = "DOCKERFILE"
+dockerfilePath = "Dockerfile"
+
+[deploy]
+startCommand = "uvicorn main:app --host 0.0.0.0 --port $PORT"
+healthcheckPath = "/health"
+restartPolicyType = "ON_FAILURE"
+restartPolicyMaxRetries = 3
+
+[deploy.memory]
+soft = 2048 # 2GB min for Playwright
+hard = 4096 # 4GB max
+
+[deploy.scaling]
+min = 1
+max = 1