fix: harden readSecret newline handling and add phpinfo version

[prateekbhujel]

What

Fixes readSecret() terminal output behavior and adds quality-of-life improvements.

readSecret() newline on Enter

readSecret() now prints a newline to stdout when the user presses Enter, so subsequent output starts on a fresh line. Previously the caller's next output would continue on the same line as the *** mask. Applies to both POSIX and Windows.

readSecret() newline on abort

readSecret() now prints a newline to stdout when the user aborts with Ctrl-C, Ctrl-D, or Escape, so the terminal prompt stays clean before the thrown error. Applies to both POSIX and Windows.

Dead code removal

Removed the written != (zend_long) ZSTR_LEN(prompt) partial-write check in the readSecret() prompt path — terminal_stream_write() already loops until all bytes are written or returns false on failure, so this check was unreachable.

Windows ZTS correctness

Marked terminal_win_stdin_is_raw as volatile so the compiler doesn't reorder or cache reads of this process-global flag around SetConsoleMode calls in ZTS builds.

phpinfo() version

phpinfo() now displays the extension version alongside backend and support status.

Tests

• tests/025_read_secret_newline.phpt — verifies newline is printed after Enter
• tests/026_read_secret_abort.phpt — verifies newline is printed before the thrown error on Ctrl-C abort

Verification

• XAMPP PHP 8.2 x86_64 build from /private/tmp with -Wall -Wextra: no warnings
• PHPT: 36 total, 33 passed, 3 expected skips, 0 failed
• php -i | grep terminal confirms version display