Initial commit: skills library

- 70 skills with code and documentation
- Add .gitignore (ignore __pycache__, output/, temp/, venv/)
- Clean up test intermediates and caches

llm-hub/.env.example

@@ -0,0 +1,20 @@
+# LLM Hub 环境变量配置
+# 复制此文件为 .env 并填入实际API Key
+
+# 火山方舟 (https://console.volcengine.com/ark)
+VOLCENGINE_API_KEY=your_volcengine_api_key_here
+
+# OpenRouter (https://openrouter.ai/)
+OPENROUTER_API_KEY=sk-your-key-here
+
+# Groq (https://console.groq.com/)
+GROQ_API_KEY=gsk_your-key-here
+
+# DeepSeek (https://platform.deepseek.com/)
+DEEPSEEK_API_KEY=sk-your-key-here
+
+# 硅基流动 (https://siliconflow.cn/)
+SILICONFLOW_API_KEY=sk-your-key-here
+
+# 阶跃星辰 (https://platform.stepfun.com/)
+STEPFUN_API_KEY=sk-your-key-here