* chore: bump fmt to 11.2.0
Acquire 6797f0c39a, which fixes compile error on GCC 15.1.
Acquire
9f269062a7,
which fixes buffer overflow in NetBSD 10.1 on GCC 10.5.
Replace `fmt::localtime` with `std::localtime`, as `fmt::` is now
deprecated.
* fix: format timezone ourselves on Windows
{fmt} 11.2.0 removed the ability to format `std::tm` with the format specifier `%z` on Windows, for a good reason. Ref: https://github.com/fmtlib/fmt/issues/4444
This forces us to implement our own solution on Windows as there's no alternative.
* fix: support `FMT_USE_EXCEPTIONS`
* fix: readability-math-missing-parentheses clang-tidy warnings
* chore: remove unused function tr_ctorGetSession()
* chore: remove unused function tr_ctorGetIncompleteDir()
* chore: make generatePublicKey() a lambda
* fix: readability-container-contains warnings
* fix: misc-use-internal-linkage warnings
* chore: inline generate_public_key() since it was only used once
