fix: declare required Unity module dependencies

[sean2077]

Summary

Adds missing built-in Unity module dependencies to the MCP for Unity package manifest:

• com.unity.modules.imageconversion
• com.unity.modules.physics2d
• com.unity.modules.screencapture

Root Cause

MCPForUnity.Runtime directly uses APIs from these modules:

• Texture2D.EncodeToPNG() from Image Conversion
• Physics2D from Physics 2D
• ScreenCapture from Screen Capture

Projects that do not already enable these built-in modules can fail script compilation after installing the package.

Validation

Validated in a Unity 6000.3.15f1 project that originally failed compiling MCPForUnity.Runtime with missing module references. After declaring the dependencies, Unity Package Manager resolved the three built-in modules and batchmode script compilation completed successfully.

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