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.

.env.example

@@ -1,12 +1,18 @@
+# --- TELEGRAM & SECURITY ---
 TELEGRAM_BOT_TOKEN=
-OWNER_CHAT_ID=
-ADMIN_CHAT_IDS=
-TEAM_CHAT_IDS=
-GOOGLE_SERVICE_ACCOUNT_FILE=
-CALENDAR_ID=
-N8N_WEBHOOK_URL=
+ADMIN_ID=
+
+# --- AI CORE ---
 OPENAI_API_KEY=
-OPENAI_MODEL=gpt-3.5-turbo
-DAILY_SUMMARY_TIME=07:00
-CALENDLY_LINK=https://calendly.com/user/appointment-link
-TIMEZONE=America/Mexico_City
+
+# --- INTEGRATIONS ---
+VIKUNJA_API_URL=https://tuservidor.com/api/v1
+VIKUNJA_TOKEN=
+GOOGLE_CREDENTIALS_PATH=./data/credentials.json
+
+# --- PRINT SERVICE ---
+SMTP_SERVER=smtp.hostinger.com
+SMTP_PORT=465
+SMTP_USER=print.service@vanityexperience.mx
+SMTP_PASS=
+IMAP_SERVER=imap.hostinger.com