fix: rename start=gui to start:gui

[omb-11]

This PR renames the npm script start=gui to start:gui in both package.json files.

The previous script used an invalid separator (=), which prevents it from being accessed via npm run start:gui.

Changes:

• package.json: rename start=gui → start:gui
• src/gui/package.json: rename start=gui → start:gui

Result:

• npm run start:gui now correctly runs the GUI dev server.

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