Add support for sardine mods (loaded by SardineHead)

[ManlyMarco]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for sardine mods, which are loaded by the SardineHead plugin, expanding the mod manager's capabilities to handle this new mod format alongside existing zipmods and plugins.

Key changes:

• Implementation of sardine mod loading infrastructure with SardineModLoader and SardineModInfo classes
• Addition of UI components for browsing and managing sardine mods
• Integration of sardine mod support into the existing mod update and management workflows

Reviewed Changes

Copilot reviewed 21 out of 24 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
SardineModLoader.cs	Core loader implementation for scanning and parsing sardine mod files (.stp/.st_)
SardineModInfo.cs	Data model representing sardine mod metadata and properties
SardineModsWindow.cs	UI window for browsing and managing sardine mods with enable/disable/delete functionality
SardineViewer.cs	Property viewer for displaying sardine mod details, images, and contents
MainWindow.cs	Integration of sardine mod browser into main window menu and refresh logic
InstallDirectoryHelper.cs	Addition of sardines directory path configuration
UpdateSourceManager.cs	Extension of update ignore list to include disabled sardine mods
Various .resx files	Localization resources for Japanese, Russian, and Chinese languages

Files not reviewed (3)

• src/KKManager/Windows/Content/SardineModsWindow.Designer.cs: Language not supported
• src/KKManager/Windows/MainWindow.Designer.cs: Language not supported
• src/KKManager/Windows/ToolWindows/Properties/Viewers/SardineViewer.Designer.cs: Language not supported

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