fix : ensure encryption key is always bytes in PrivacyManager

[tmdeveloper007]

Summary of What Has Been Done

In src/utils/privacy.py, the PrivacyManager.__init__ was calling Fernet(self.encryption_key) where encryption_key could be either str (from os.getenv) or bytes (from Fernet.generate_key()). Fixed by explicitly encoding the string key to bytes before passing to Fernet.

Changes Made

• Modified __init__ in src/utils/privacy.py to call .encode("utf-8") on the key when it is a string

Impact it Made

• Consistent bytes-only key type regardless of environment configuration
• Prevents potential Fernet initialization failures with mixed types

Closes #1306

Note: Please assign this PR to the tmdeveloper007 account.

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