Revert "Vercel sandbox support"

.env.example

@@ -1,20 +1,20 @@
-# Required
-FIRECRAWL_API_KEY=your_firecrawl_api_key  # Get from https://firecrawl.dev (Web scraping)
+# REQUIRED - Sandboxes for code execution
+# Get yours at https://e2b.dev
+E2B_API_KEY=your_e2b_api_key_here
 
-# Vercel Sandbox Authentication (choose one method)
-# See: https://vercel.com/docs/vercel-sandbox#authentication
+# REQUIRED - Web scraping for cloning websites
+# Get yours at https://firecrawl.dev
+FIRECRAWL_API_KEY=your_firecrawl_api_key_here
 
-# Method 1: OIDC Token (recommended for development)
-# Run `vercel link` then `vercel env pull` to get VERCEL_OIDC_TOKEN automatically
-# VERCEL_OIDC_TOKEN=auto_generated_by_vercel_env_pull
+# OPTIONAL - AI Providers (need at least one)
+# Get yours at https://console.anthropic.com
+ANTHROPIC_API_KEY=your_anthropic_api_key_here
 
-# Method 2: Personal Access Token (for production or when OIDC unavailable)
-# VERCEL_TEAM_ID=team_xxxxxxxxx      # Your Vercel team ID 
-# VERCEL_PROJECT_ID=prj_xxxxxxxxx    # Your Vercel project ID
-# VERCEL_TOKEN=vercel_xxxxxxxxxxxx   # Personal access token from Vercel dashboard
+# Get yours at https://platform.openai.com
+OPENAI_API_KEY=your_openai_api_key_here
 
-# Optional (need at least one AI provider)
-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 - Kimi K2 recommended)
+# Get yours at https://aistudio.google.com/app/apikey
+GEMINI_API_KEY=your_gemini_api_key_here
+
+# Get yours at https://console.groq.com
+GROQ_API_KEY=your_groq_api_key_here