feat: 青主题产品壳与静态资源版本号

对齐 SPA 顶栏工具条与清青强调色，CSS/JS 带构建 ?v= 长缓存穿透。

Co-authored-by: Cursor <cursoragent@cursor.com>

build.ps1

@@ -14,6 +14,12 @@ $MainPkg = './cmd/jiang13'
 $BuildDir = 'dist'
 $DevDataDir = 'dist/data'
 $Version = '1.0.0'
+try {
+    $gitSha = (git rev-parse --short HEAD 2>$null)
+    if ($LASTEXITCODE -eq 0 -and $gitSha) {
+        $Version = "1.0.0+$gitSha"
+    }
+} catch {}
 $RegistryImage = 'hangzhang714128/jiang13-forum'
 $Ldlags = "-s -w -X main.version=$Version"