refactor: Overhaul project structure and role management

This commit implements the first phase of the new architectural vision for the Talia Bot.

Key changes include:
- Renamed the main application directory from `app` to `talia_bot` and updated all associated imports and configurations (`Dockerfile`, tests).
- Replaced the static, `.env`-based permission system with a dynamic, database-driven role management system.
- Introduced a `db.py` module to manage a SQLite database (`users.db`) for user persistence.
- Updated `identity.py` to fetch roles ('admin', 'crew', 'client') from the database.
- Rewrote the `README.md` and `.env.example` to align with the new project specification.
- Refactored the LLM module into the new `modules` structure.

talia_bot/db.py

@@ -0,0 +1,48 @@
+# talia_bot/db.py
+# This module will handle the database connection and operations.
+
+import sqlite3
+import logging
+
+DATABASE_FILE = "talia_bot/data/users.db"
+
+logger = logging.getLogger(__name__)
+
+def get_db_connection():
+    """Creates a connection to the SQLite database."""
+    conn = sqlite3.connect(DATABASE_FILE)
+    conn.row_factory = sqlite3.Row
+    return conn
+
+def setup_database():
+    """Sets up the database tables if they don't exist."""
+    try:
+        conn = get_db_connection()
+        cursor = conn.cursor()
+
+        # Create the users table
+        cursor.execute("""
+            CREATE TABLE IF NOT EXISTS users (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                telegram_id INTEGER UNIQUE NOT NULL,
+                role TEXT NOT NULL CHECK(role IN ('admin', 'crew', 'client')),
+                name TEXT,
+                employee_id TEXT,
+                branch TEXT
+            )
+        """)
+
+        conn.commit()
+        logger.info("Database setup complete. 'users' table is ready.")
+    except sqlite3.Error as e:
+        logger.error(f"Database error during setup: {e}")
+    finally:
+        if conn:
+            conn.close()
+
+if __name__ == '__main__':
+    # This allows us to run the script directly to initialize the database
+    logging.basicConfig(level=logging.INFO)
+    logger.info("Running database setup manually...")
+    setup_database()
+    logger.info("Manual setup finished.")