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`.

modules/logger.py

@@ -0,0 +1,29 @@
+import logging
+from modules.database import SessionUsersAlma
+from models.users_alma_models import RequestLog
+
+def log_request(telegram_id, username, command, message):
+    if not SessionUsersAlma:
+        logging.debug("DB log omitted (DB not configured).")
+        return
+
+    try:
+        db_session = SessionUsersAlma()
+    except Exception as exc:
+        logging.error(f"Could not create DB session, logging is disabled: {exc}")
+        return
+    try:
+        log_entry = RequestLog(
+            telegram_id=str(telegram_id),
+            username=username,
+            command=command,
+            message=message
+        )
+        db_session.add(log_entry)
+        db_session.commit()
+        logging.info(f"Log saved: {command} from {username}")
+    except Exception as e:
+        logging.error(f"Error saving log: {e}")
+        db_session.rollback()
+    finally:
+        db_session.close()