🔒 Fix hardcoded SMTP password in enviar_factura.py

[LVT-ENG]

🎯 What: The hardcoded SMTP app password placeholder in enviar_factura.py was replaced with secure environment variable retrieval.
⚠️ Risk: Hardcoding credentials, even placeholders, in source code poses a critical security risk. If pushed to a public repository or accessed by unauthorized users, the credentials could be exploited to compromise the associated email account.
🛡️ Solution: The script now securely retrieves the password from the EMAIL_PASS environment variable using os.getenv(), and raises an explicit ValueError if the variable is missing to prevent silent authentication failures.

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PR created automatically by Jules for task 10744390017496530565 started by @LVT-ENG

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