Add PAT login

env.sample

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+# Required
+FIRECRAWL_API_KEY=your_firecrawl_api_key  # Get from https://firecrawl.dev (Web scraping)
+
+# Vercel Sandbox Authentication (choose one method)
+# See: https://vercel.com/docs/vercel-sandbox#authentication
+
+# Method 1: OIDC Token (recommended for development)
+# Run `vercel env pull` to get VERCEL_OIDC_TOKEN automatically
+# VERCEL_OIDC_TOKEN=auto_generated_by_vercel_env_pull
+
+# Method 2: Personal Access Token (for production or when OIDC unavailable)
+# Get these values from your Vercel dashboard
+# VERCEL_TEAM_ID=team_xxxxxxxxx
+# VERCEL_PROJECT_ID=prj_xxxxxxxxx  
+# VERCEL_TOKEN=vercel_xxxxxxxxxxxx
+
+# Optional AI providers (need at least one)
+ANTHROPIC_API_KEY=your_anthropic_api_key  # Get from https://console.anthropic.com
+OPENAI_API_KEY=your_openai_api_key        # Get from https://platform.openai.com (GPT-5)
+GEMINI_API_KEY=your_gemini_api_key        # Get from https://aistudio.google.com/app/apikey
+GROQ_API_KEY=your_groq_api_key            # Get from https://console.groq.com (Fast inference)