fix(postgresql): provision meson, ninja and winflexbison on windows

- the meson build assumed meson/ninja/win_flex/win_bison/perl on PATH,
  which only held on machines that had them installed
- add meson, ninja and winflexbison tool packages and declare them via
  tools@windows on postgresql, together with the existing strawberry-perl
- meson no longer ships a Windows MSI, so the wheel is installed offline
  into a venv: postgres re-invokes meson through find_program, which
  needs the real meson.exe launcher pip generates

src/Package/Artifact/meson_win.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Package\Artifact;
+
+use StaticPHP\Attribute\Artifact\AfterBinaryExtract;
+use StaticPHP\Exception\EnvironmentException;
+use StaticPHP\Util\FileSystem;
+
+class meson_win
+{
+    /**
+     * Meson 1.11 dropped the Windows MSI, so the artifact is the wheel, installed offline
+     * into a private venv. The venv is not just packaging hygiene: pip generates a real
+     * meson.exe launcher there, and PostgreSQL needs one because its build re-invokes meson
+     * through find_program(), which rejects non-executables like the meson.pyz zipapp.
+     */
+    #[AfterBinaryExtract('meson', ['windows-x86_64'])]
+    public function afterExtract(string $target_path): void
+    {
+        $dir = dirname($target_path);
+        $venv = "{$dir}\\venv";
+
+        $python = null;
+        foreach (['python', 'py -3'] as $candidate) {
+            [$code] = cmd()->execWithResult("{$candidate} --version", false);
+            if ($code === 0) {
+                $python = $candidate;
+                break;
+            }
+        }
+        if ($python === null) {
+            throw new EnvironmentException('meson needs Python 3 on PATH. Install it from https://www.python.org or with `winget install Python.Python.3.13`.');
+        }
+
+        if (is_dir($venv)) {
+            FileSystem::removeDir($venv);
+        }
+        cmd()->exec("{$python} -m venv \"{$venv}\"")
+            ->exec("\"{$venv}\\Scripts\\python.exe\" -m pip install --no-index --no-deps \"{$target_path}\"");
+
+        FileSystem::writeFile("{$dir}\\meson.bat", "@echo off\r\n\"%~dp0venv\\Scripts\\meson.exe\" %*\r\n");
+    }
+}