fixed findings from review

.env.example

@@ -0,0 +1,16 @@
+# Lovdata Chat Environment Configuration
+
+# MCP Server Configuration
+# URL of the external lovdata MCP server
+MCP_SERVER=http://localhost:8001
+
+# LLM API Keys (optional - at least one required)
+OPENAI_API_KEY=
+ANTHROPIC_API_KEY=
+GOOGLE_API_KEY=
+
+# Development Settings
+# These are configured in docker-compose.yml
+# DOCKER_HOST=tcp://docker-daemon:2376
+# DOCKER_TLS_VERIFY=1
+# DOCKER_CERT_PATH=/certs