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

deploy/railway/README.md

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+# Railway Deployment
+
+## Quick Deploy
+[![Deploy on Railway](https://railway.app/button.svg)](https://railway.app/template/crawl4ai)
+
+## Manual Setup
+1. Fork this repository
+2. Create a new Railway project 
+3. Configure environment variables:
+   - `INSTALL_TYPE`: basic or all
+   - `ENABLE_GPU`: true/false
+4. Deploy!
+
+## Configuration
+See `railway.toml` for:
+- Memory limits
+- Health checks
+- Restart policies
+- Scaling options

deploy/railway/button.json

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+{
+    "name": "Crawl4AI",
+    "description": "LLM Friendly Web Crawler & Scraper",
+    "render": {
+      "dockerfile": {
+        "path": "Dockerfile"
+      }
+    },
+    "env": [
+      {
+        "key": "INSTALL_TYPE",
+        "description": "Installation type (basic/all)",
+        "default": "basic",
+        "required": true
+      },
+      {
+        "key": "ENABLE_GPU",
+        "description": "Enable GPU support",
+        "default": "false",
+        "required": false
+      }
+    ],
+    "services": [
+      {
+        "name": "web",
+        "dockerfile": "./Dockerfile",
+        "healthcheck": {
+          "path": "/health",
+          "port": 11235
+        }
+      }
+    ]
+  }

deploy/railway/railway.toml

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+# 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