feat(email): add admin notification settings

apps/backend/migration_steps/email_notification_settings.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from sqlalchemy import text
+from sqlalchemy.engine import Connection
+
+
+def apply(conn: Connection) -> None:
+    conn.execute(
+        text(
+            """
+            CREATE TABLE IF NOT EXISTS email_notification_settings (
+                id INTEGER PRIMARY KEY,
+                smtp_server VARCHAR(255) NOT NULL DEFAULT '',
+                smtp_port INTEGER NOT NULL DEFAULT 465,
+                smtp_sender_email VARCHAR(255) NOT NULL DEFAULT '',
+                smtp_sender_password VARCHAR(500) NOT NULL DEFAULT '',
+                smtp_use_ssl BOOLEAN NOT NULL DEFAULT 1,
+                notify_token_expiring BOOLEAN NOT NULL DEFAULT 1,
+                notify_check_in_success BOOLEAN NOT NULL DEFAULT 1,
+                created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+                updated_at DATETIME
+            )
+            """
+        )
+    )
+    conn.commit()