[add] page composition stages

src/Simplify.Web/PageComposition/Stages/ContextVariablesSetter.cs

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+using Simplify.Web.Modules.Context;
+
+namespace Simplify.Web.PageComposition.Stages;
+
+public class ContextVariablesSetter(IWebContextProvider webContextProvider) : IPageCompositionStage
+{
+	/// <summary>
+	/// The site variable name site URL.
+	/// </summary>
+	public const string VariableNameSiteUrl = "SV:SiteUrl";
+
+	/// <summary>
+	/// The site variable name site virtual path (returns '/yoursite' if your site is placed in virtual directory like http://yourdomain.com/yoursite/).
+	/// </summary>
+	public const string VariableNameSiteVirtualPath = "~";
+
+	public void Execute(Modules.Data.IDataCollector dataCollector)
+	{
+		var context = webContextProvider.Get();
+
+		dataCollector.Add(VariableNameSiteUrl, context.SiteUrl);
+		dataCollector.Add(VariableNameSiteVirtualPath, context.VirtualPath);
+	}
+}

src/Simplify.Web/PageComposition/Stages/EnvironmentVariablesInjectionStage.cs

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+using Simplify.Web.Modules.ApplicationEnvironment;
+using Simplify.Web.Modules.Data;
+
+namespace Simplify.Web.PageComposition.Stages;
+
+public class EnvironmentVariablesInjectionStage(IDynamicEnvironment dynamicEnvironment) : IPageCompositionStage
+{
+	/// <summary>
+	/// The site variable name templates directory.
+	/// </summary>
+	public const string VariableNameTemplatesPath = "SV:TemplatesDir";
+
+	/// <summary>
+	/// The site variable name current style.
+	/// </summary>
+	public const string VariableNameSiteStyle = "SV:Style";
+
+	public void Execute(IDataCollector dataCollector)
+	{
+		dataCollector.Add(VariableNameTemplatesPath, dynamicEnvironment.TemplatesPath);
+		dataCollector.Add(VariableNameSiteStyle, dynamicEnvironment.SiteStyle);
+	}
+}

src/Simplify.Web/PageComposition/Stages/LanguageInjectionStage.cs

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+using System.Threading;
+using Simplify.Web.Modules.Data;
+using Simplify.Web.Modules.Localization;
+
+namespace Simplify.Web.PageComposition.Stages;
+
+public class LanguageInjectionStage(ILanguageManagerProvider languageManagerProvider) : IPageCompositionStage
+{
+	/// <summary>
+	/// The site variable name current language.
+	/// </summary>
+	public const string VariableNameCurrentLanguage = "SV:Language";
+
+	/// <summary>
+	/// The site variable name current language extension.
+	/// </summary>
+	public const string VariableNameCurrentLanguageExtension = "SV:LanguageExt";
+
+	/// <summary>
+	///  The site variable name current language culture name.
+	/// </summary>
+	public const string VariableNameCurrentLanguageCultureName = "SV:LanguageCultureName";
+
+	/// <summary>
+	/// The site variable name current language culture name extension.
+	/// </summary>
+	public const string VariableNameCurrentLanguageCultureNameExtension = "SV:LanguageCultureNameExt";
+
+	public void Execute(IDataCollector dataCollector)
+	{
+		var languageManager = languageManagerProvider.Get();
+
+		if (!string.IsNullOrEmpty(languageManager.Language))
+		{
+			dataCollector.Add(VariableNameCurrentLanguage, languageManager.Language);
+			dataCollector.Add(VariableNameCurrentLanguageExtension, "." + languageManager.Language);
+			dataCollector.Add(VariableNameCurrentLanguageCultureName, Thread.CurrentThread.CurrentCulture.TextInfo.CultureName);
+			dataCollector.Add(VariableNameCurrentLanguageCultureNameExtension, "." + Thread.CurrentThread.CurrentCulture.TextInfo.CultureName);
+		}
+		else
+		{
+			dataCollector.Add(VariableNameCurrentLanguage, (string?)null);
+			dataCollector.Add(VariableNameCurrentLanguageExtension, (string?)null);
+			dataCollector.Add(VariableNameCurrentLanguageCultureName, (string?)null);
+			dataCollector.Add(VariableNameCurrentLanguageCultureNameExtension, (string?)null);
+		}
+	}
+}

src/Simplify.Web/PageComposition/Stages/SiteTitleInjectionStage.cs

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+using Simplify.Web.Modules.Context;
+using Simplify.Web.Modules.Data;
+
+namespace Simplify.Web.PageComposition.Stages;
+
+public class SiteTitleInjectionStage(IWebContextProvider webContextProvider, IStringTable stringTable) : IPageCompositionStage
+{
+	/// <summary>
+	/// The site title string table variable name.
+	/// </summary>
+	public const string SiteTitleStringTableVariableName = "SiteTitle";
+
+	public void Execute(IDataCollector dataCollector)
+	{
+		var context = webContextProvider.Get();
+		var currentPath = context.Request.Path.Value;
+		var siteTitle = stringTable.GetItem(SiteTitleStringTableVariableName);
+
+		if (string.IsNullOrEmpty(siteTitle))
+			return;
+
+		if (string.IsNullOrEmpty(currentPath) ||
+			currentPath == "/" ||
+			currentPath!.StartsWith("/?") ||
+			!dataCollector.IsDataExist(dataCollector.TitleVariableName))
+			dataCollector.Add(dataCollector.TitleVariableName, siteTitle);
+		else
+			dataCollector.Add(dataCollector.TitleVariableName, " - " + siteTitle);
+	}
+}

src/Simplify.Web/PageComposition/Stages/StopwatchDataInjectionStage.cs

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+using Simplify.Web.Diagnostics.Measurement;
+
+namespace Simplify.Web.PageComposition.Stages;
+
+public class StopwatchDataInjectionStage(IStopwatchProvider stopwatchProvider) : IPageCompositionStage
+{
+	public const string VariableNameExecutionTime = "SV:SiteExecutionTime";
+
+	public void Execute(Modules.Data.IDataCollector dataCollector) =>
+		dataCollector.Add(VariableNameExecutionTime, stopwatchProvider.StopAndGetMeasurement().ToString("mm\\:ss\\:fff"));
+}

src/Simplify.Web/PageComposition/Stages/StringTableItemsInjectionStage.cs

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+using System.Collections.Generic;
+using Simplify.Web.Modules.Data;
+
+namespace Simplify.Web.PageComposition.Stages;
+
+public class StringTableItemsInjectionStage(IStringTable stringTable) : IPageCompositionStage
+{
+	private const string StringTablePrefix = "StringTable.";
+
+	private readonly IStringTable _stringTable = stringTable;
+
+	public void Execute(IDataCollector dataCollector)
+	{
+		foreach (var item in (IDictionary<string, object>)_stringTable.Items)
+			dataCollector.Add(StringTablePrefix + item.Key, item.Value.ToString());
+	}
+}