Add entrypoint configuration docs for Godot and Unity

[cloud9c]

Summary

• Add "Entrypoint configuration" section to Godot and Unity engine pages documenting the entrypointParams object that Wavedash extracts from exported HTML during wvdsh build push
• Godot table covers 12 config fields (loader, executable, thread pools, canvas policy, file sizes, etc.)
• Unity table covers 10 config fields (loader, data/framework/code URLs, project metadata, etc.)

Test plan

• Ran mint dev and verified both pages render at /engines/godot and /engines/unity
• Verified tables render correctly with code formatting and descriptions

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