✨ Quality: Add .env template file with descriptions

.env.example

@@ -0,0 +1,39 @@
+# LLM Provider Configuration
+# OpenAI API Key for GPT models
+OPENAI_API_KEY=
+# OpenAI API Base URL (optional, defaults to https://api.openai.com/v1)
+OPENAI_API_BASE=
+# Anthropic API Key for Claude models
+ANTHROPIC_API_KEY=
+# DeepSeek API Key
+DEEPSEEK_API_KEY=
+
+# Search Tool Configuration
+# Serper API Key for Google Search
+SERPER_API_KEY=
+# Tavily API Key for AI-optimized search
+TAVILY_API_KEY=
+
+# Email Server Configuration
+# SMTP server address
+EMAIL_SMTP_SERVER=
+# SMTP server port (e.g., 465 for SSL, 587 for TLS)
+EMAIL_SMTP_PORT=
+# Sender email address
+EMAIL_SENDER_ADDRESS=
+# Sender email password or app-specific password
+EMAIL_SENDER_PASSWORD=
+
+# Object Storage Service (OSS) Configuration
+# OSS Access Key ID
+OSS_ACCESS_KEY_ID=
+# OSS Access Key Secret
+OSS_ACCESS_KEY_SECRET=
+# OSS Endpoint
+OSS_ENDPOINT=
+# OSS Bucket Name
+OSS_BUCKET_NAME=
+
+# Miscellaneous
+# Logging level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
+LOG_LEVEL=INFO