Add v2 sandbox implementation with new API routes and sandbox library

packages/create-open-lovable/templates/vercel/.env.example

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+# Open Lovable Configuration - Vercel Provider
+
+# Sandbox Provider
+SANDBOX_PROVIDER=vercel
+
+# REQUIRED - Vercel Sandboxes
+# Option 1: OIDC Token (automatic in Vercel environment)
+# Option 2: Personal Access Token (configure below)
+VERCEL_TEAM_ID=your_team_id
+VERCEL_PROJECT_ID=your_project_id
+VERCEL_TOKEN=your_access_token
+
+# REQUIRED - Web scraping for cloning websites
+# Get yours at https://firecrawl.dev
+FIRECRAWL_API_KEY=your_firecrawl_api_key_here
+
+# OPTIONAL - AI Providers (need at least one)
+# Get yours at https://console.anthropic.com
+ANTHROPIC_API_KEY=your_anthropic_api_key_here
+
+# Get yours at https://platform.openai.com
+OPENAI_API_KEY=your_openai_api_key_here
+
+# 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