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`.

models/users_alma_models.py

@@ -0,0 +1,31 @@
+from sqlalchemy import create_engine, Column, Integer, String, Enum, TIMESTAMP
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.sql import func
+from datetime import datetime
+
+Base = declarative_base()
+
+class RequestLog(Base):
+    __tablename__ = 'request_logs'
+    __table_args__ = {'schema': 'USERS_ALMA'}
+    id = Column(Integer, primary_key=True)
+    telegram_id = Column(String(50))
+    username = Column(String(100))
+    command = Column(String(100))
+    message = Column(String(500))
+    created_at = Column(TIMESTAMP, server_default=func.now())
+
+class User(Base):
+    __tablename__ = 'users'
+    __table_args__ = {'schema': 'USERS_ALMA'}
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    username = Column(String(50), unique=True)
+    role = Column(Enum('admin', 'manager', 'user'))
+    first_name = Column(String(100))
+    last_name = Column(String(100))
+    email = Column(String(100), unique=True)
+    cell_phone = Column(String(20))
+    telegram_id = Column(String(50), unique=True)
+    created_at = Column(TIMESTAMP, server_default=func.now())
+    updated_at = Column(TIMESTAMP, server_default=func.now(), onupdate=func.now())