Remove 'preview' tag from package metadata

.NET 10 LTS is now released, so the preview tag is outdated.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ANcpLua

CreatePdf.NET/CreatePdf.NET.csproj

@@ -9,7 +9,7 @@
     <Version>3.0.0</Version>
     <Authors>Alexander Nachtmann</Authors>
     <Description>A simple, .NET library for PDF creation with text and bitmap rendering, plus optional OCR functionality for text extraction.</Description>
-    <PackageTags>pdf;document;generation;lightweight;net10;preview;ocr</PackageTags>
+    <PackageTags>pdf;document;generation;lightweight;net10;ocr</PackageTags>
     <RepositoryUrl>https://github.com/ANcpLua/CreatePdf.NET</RepositoryUrl>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageReadmeFile>README.md</PackageReadmeFile>