fix: keep quiet password uploads working

[yoldaolmak]

Summary

• initialize the successful upload counter even when password mode runs with
• preserve the previous count when a path is not converted into a post
• add a small credential-free unittest for the quiet upload path

Verification

This fixes a real automation edge case: quiet password-mode uploads should not depend on progress logging being enabled.

[yoldaolmak]

Note on the FOSSA check: this PR does not add any runtime or test dependency; it only changes the password-mode counter initialization and adds a stdlib . Local verification passed with .

[yoldaolmak]

Correction to the note above: this PR does not add any runtime or test dependency; it only changes the password-mode counter initialization and adds a stdlib unittest. Local verification passed with:

python3 -m unittest tests.test_password_uploader