chore: update .gitignore to include all .env.local files and remove backup example environment file for Claude Agent SDK

Author: xingjian.ym

.gitignore

@@ -17,6 +17,7 @@ node_modules
 .pnpm-store
 
 **/.poetry-cache
-integrations/claude-agent-sdk/typescript/.env.local
+**/.env.local
+integrations/claude-agent-sdk/**/.env.local
 **/pnpm-lock.yaml
 pnpm-lock.yaml

integrations/claude-agent-sdk/typescript/examples/.env.local.backup

@@ -0,0 +1,10 @@
+# Claude Agent SDK Integration - Environment Variables
+# Copy this file to .env.local and fill in your actual values
+
+# Anthropic API Key (required for real API tests)
+# Get your API key from: https://console.anthropic.com/
+# ANTHROPIC_API_KEY=your-anthropic-api-key-here
+
+# Optional for third party service
+# ANTHROPIC_AUTH_TOKEN=third-party-auth-token
+# ANTHROPIC_BASE_URL=third-party-base-url