🛡️ Sentinel: Fix password truncation for passwords with spaces

[google-labs-jules]

🛡️ Sentinel Security Fix: Prevent Password Truncation

Vulnerability:
The entrypoint.sh script used unquoted variable expansion when adding users: adduser $username $password. If a password contained spaces (e.g., "secure phrase"), the shell would split it into multiple arguments. The adduser function, which calls vpncmd_hub, would then use only the first word as the password. This meant users believing they had a strong passphrase actually had a truncated one.

Fix:
Quoted the variables: adduser "$username" "$password". This ensures the password is treated as a single argument, preserving spaces and special characters.

Verification:
Added tests/verify_password_fix.sh which mocks the internal functions to demonstrate the failure with unquoted variables and success with quoted ones.
Verified that the fix correctly passes the full password string.

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PR created automatically by Jules for task 2742173403342152479 started by @bluPhy

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