refactor: many changes

- Add missing actions and make a clear boundary between actions,
  services and nfra (i.e: actions shouldn't use stuff from infra/)
- Delete stuff not in use: tts, gtts, etc
- Add a ton of tests

migrations/20250226120422_rename_settings_to_chatbot.py

@@ -0,0 +1,19 @@
+"""
+This module contains a Caribou migration.
+
+Migration Name: rename_settings_to_chatbot
+Migration Version: 20250226120422
+"""
+
+
+def upgrade(connection):
+    sql = """
+    ALTER TABLE settings RENAME TO chatbot;
+    """
+    connection.execute(sql)
+    connection.commit()
+
+
+def downgrade(connection):
+    # add your downgrade step here
+    pass