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/thai-frontend-dev/scripts/create_astro_website.py

@@ -115,9 +115,9 @@ def ask_analytics_setup():
         print("\n   📈 Umami Analytics Setup")
 
         # Check if Umami credentials are configured
-        from dotenv import load_dotenv
+        from skills._env_loader import load_unified_env
 
-        load_dotenv(os.path.join(os.path.dirname(__file__), "../../../.env"))
+        load_unified_env()
 
         umami_url = os.getenv("UMAMI_URL", "")
         umami_username = os.getenv("UMAMI_USERNAME", "")
@@ -148,9 +148,9 @@ def ask_analytics_setup():
             print("\n   Please provide your existing GA4 details:")
 
             # Check unified .env for GA4 credentials
-            from dotenv import load_dotenv
+            from skills._env_loader import load_unified_env
 
-            load_dotenv(os.path.join(os.path.dirname(__file__), "../../../.env"))
+            load_unified_env()
 
             ga4_property_id = os.getenv("GA4_PROPERTY_ID", "")
             ga4_credentials_path = os.getenv("GA4_CREDENTIALS_PATH", "")