Move .env into skills/ for easy install

- Added skills/_env_loader.py - shared env loader for all scripts
- Updated 17 scripts to use load_unified_env()
- Updated install-skills.sh to copy .env into skills/
- Updated README with simpler OpenClaw install instructions
- .env in skills/ is gitignored (credentials stay private)

skills/alphaear-sentiment/scripts/llm/capability.py

@@ -72,9 +72,9 @@ class ModelCapabilityRegistry:
 
 if __name__ == "__main__":
     import os
-    from dotenv import load_dotenv
+    from skills._env_loader import load_unified_env
 
-    load_dotenv(os.path.expanduser("~/.config/opencode/.env"))
+    load_unified_env()
 
     # 测试当前配置的模型
     p = os.getenv("LLM_PROVIDER", "minimax")

skills/alphaear-sentiment/scripts/llm/router.py

@@ -2,11 +2,11 @@ import os
 from typing import Optional, List, Dict, Any, Union
 from agno.models.base import Model
 from loguru import logger
-from dotenv import load_dotenv
 from .llm.factory import get_model
 from utils.llm.capability import ModelCapabilityRegistry
+from skills._env_loader import load_unified_env
 
-load_dotenv(os.path.expanduser("~/.config/opencode/.env"))
+load_unified_env()
 
 
 class ModelRouter: