chore(tests): organize test scripts and beautify account creation email

- Moved scattered Python test scripts from root and 'admin/development/' to 'tests/'.
- Beautified the HTML email body for account creation links in 'app/methods/person_methods.py' with a modern responsive design.

tests/check_site_schema_remote.py

@@ -0,0 +1,25 @@
+import requests
+import json
+
+BASE_URL = "https://dev-api.oneskyit.com/v3/crud"
+ACCOUNT_ID = "nqOzejLCDXM"
+
+def get_headers():
+    return {"X-Account-ID": ACCOUNT_ID}
+
+def check_schema(obj):
+    print(f"--- Schema for {obj} ---")
+    url = f"{BASE_URL}/{obj}/schema"
+    r = requests.get(url, headers=get_headers())
+    if r.status_code == 200:
+        data = r.json()['data']
+        cols = [c['field'] for col in [data['database']['columns']] for c in col]
+        print(f"Columns: {cols}")
+        fields = list(data['model']['fields'].keys())
+        print(f"Pydantic Fields: {fields}")
+    else:
+        print(f"Error {r.status_code}: {r.text}")
+
+if __name__ == "__main__":
+    check_schema("site")
+    check_schema("site_domain")