Build 3 shipped VC++ runtime DLLs that did not match the toolset the binaries were built with, and the service crashed at startup on fresh installs. This build corrects the installer payload.

The detail: hMailServer.exe is built with v145 (14.51), but build 3 bundled VS2019-era (14.25) VC++ runtime DLLs app-local in Bin\. Those app-local copies were loaded instead of the system runtimes, and the service died at startup with 0xC0000005 in msvcp140!mtx_do_lock, reached via boost regex and std::mutex. Fresh installs were the ones affected.

Changes in this build:

• The installer now ships Microsoft.VC145.CRT (14.51.36231), matching the build toolset. The stale Microsoft.VC142.CRT payload has been removed.
• The bundled 2015-era UCRT has been removed. It has been in-box since Server 2016 and Windows 10.
• build/run-tests.ps1: fixed a stdout/stderr pipe deadlock in the test runner.

The full regression gate ran against MariaDB on the MYSQL backend: 898 of 898 passed.

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