feat: Implement multi-database architecture

This commit introduces a three-database architecture to the application,
as specified in the `db_logic.md` file.

The changes include:
- A SQL initialization script (`db/init/init.sql`) to create the
  `USERS_ALMA`, `vanity_hr`, and `vanity_attendance` databases and their
  respective tables.
- SQLAlchemy models for all tables, organized into separate files
  within the `models` directory.
- Refactoring of the database connection logic in `modules/database.py`
  to support connections to all three databases.
- Creation of a `modules/logger.py` to handle request logging to the
  `USERS_ALMA` database.
- Updates to `docker-compose.yml` to mount the initialization script and
  build the bot image locally.
- Updates to `.env.example` to include the new database environment
  variables.
- Restoration of the data dictionary to `db_tasks.md`.

.env.example

@@ -32,7 +32,9 @@ WEBHOOK_PERMISOS=url
 
 # --- DATABASE ---
 # Usado por el servicio de la base de datos en docker-compose.yml
-MYSQL_DATABASE=vanessa_logs
+MYSQL_DATABASE_USERS_ALMA=USERS_ALMA
+MYSQL_DATABASE_VANITY_HR=vanity_hr
+MYSQL_DATABASE_VANITY_ATTENDANCE=vanity_attendance
 MYSQL_USER=user
 MYSQL_PASSWORD=password
 MYSQL_ROOT_PASSWORD=rootpassword