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-predictor/scripts/utils/predictor/training.py

@@ -10,9 +10,9 @@ import random
 from loguru import logger
 from datetime import datetime, timedelta
 from sentence_transformers import SentenceTransformer
-from dotenv import load_dotenv
+from skills._env_loader import load_unified_env
 
-load_dotenv(os.path.expanduser("~/.config/opencode/.env"))
+load_unified_env()
 
 # Setup paths
 KRONOS_DIR = os.path.dirname(os.path.abspath(__file__))