feat: 支持 Python 3.8+ (0.3.0)

- requires-python >=3.8, classifiers 增加 3.8/3.9
- 代码经 ast feature_version=(3,8) 校验, 无 3.9+ 专属语法; str|None 等注解由 future annotations 延迟求值
- CI 测试/构建/smoke 矩阵扩展为 3.8-3.14, 裸资产数 6→8
- 注意: Windows runner 需预装 Python 3.8 与 3.9 (py launcher)

.gitea/workflows/publish-dlp-io.yaml

@@ -95,11 +95,11 @@ jobs:
           "DLP_IO_PACKAGE_VERSION=$packageVersion" | Out-File $env:GITHUB_ENV -Encoding utf8 -Append
           Write-Host "package source: $tag @ $headCommit"
 
-      - name: Test Python 3.10-3.14
+      - name: Test Python 3.8-3.14
         shell: pwsh
         run: |
           $ErrorActionPreference = "Stop"
-          foreach ($pythonVersion in @("3.10", "3.11", "3.12", "3.13", "3.14")) {
+          foreach ($pythonVersion in @("3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14")) {
             & py "-$pythonVersion" --version
             if ($LASTEXITCODE -ne 0) { throw "Python $pythonVersion is required" }
             & py "-$pythonVersion" -m pip install -r requirements-dev.txt --progress-bar off
@@ -124,7 +124,7 @@ jobs:
             "dlp_io-$version-py3-none-any.whl",
             "dlp_io-$version.tar.gz"
           )
-          foreach ($pythonVersion in @("3.10", "3.11", "3.12", "3.13", "3.14")) {
+          foreach ($pythonVersion in @("3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14")) {
             $abi = $pythonVersion.Replace(".", "")
             $wheel = "dlp_io-$version-cp$abi-cp$abi-win_amd64.whl"
             $env:DLP_IO_PYD = "1"
@@ -164,7 +164,7 @@ jobs:
             }
           }
           $bareAssets = @(Get-ChildItem -LiteralPath $assetsDir -File | ForEach-Object Name)
-          if ($bareAssets.Count -ne 6) {
+          if ($bareAssets.Count -ne 8) {
             throw "bare asset set mismatch: $($bareAssets -join ', ')"
           }
 
@@ -198,7 +198,7 @@ jobs:
             }
           }
 
-          foreach ($pythonVersion in @("3.10", "3.11", "3.12", "3.13", "3.14")) {
+          foreach ($pythonVersion in @("3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14")) {
             $abi = $pythonVersion.Replace(".", "")
             $pydWheel = (Resolve-Path (Join-Path dist "dlp_io-$($env:DLP_IO_PACKAGE_VERSION)-cp$abi-cp$abi-win_amd64.whl")).Path
             $pydRoot = Join-Path $env:TEMP ("dlp-io-pyd-smoke-$abi-" + $PID)
@@ -232,7 +232,7 @@ jobs:
             throw "unsafe bare smoke path: $bareRootFull"
           }
           try {
-            foreach ($pythonVersion in @("3.10", "3.11", "3.12", "3.13", "3.14")) {
+            foreach ($pythonVersion in @("3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14")) {
               $abi = $pythonVersion.Replace(".", "")
               $sandbox = Join-Path $bareRootFull "cp$abi"
               New-Item -ItemType Directory -Force $sandbox | Out-Null
@@ -293,7 +293,7 @@ jobs:
               "## 产物",
               "",
               "- ``dlp_io-$version-py3-none-any.whl``：纯 Python wheel，pip 安装，跨平台",
-              "- ``dlp_io-$version-cp3XX-cp3XX-win_amd64.whl``：pyd wheel，pip 安装，Windows 按解释器版本选用（cp310-cp314）",
+              "- ``dlp_io-$version-cp3XX-cp3XX-win_amd64.whl``：pyd wheel，pip 安装，Windows 按解释器版本选用（cp38-cp314）",
               "- ``dlp_io-$version.tar.gz``：sdist 源码包",
               "- ``dlp_io.py`` / ``dlp_io.cp3XX-win_amd64.pyd``：免安装单文件，直接放进项目目录即可 ``import dlp_io``",
               "",