feat: add mock update server

[nmggithub]

What Changed

cc @juliusmarminge

This adds a simple mock update server to our setup. There are several ways to use it, docs can be added if desired.

Here are the basics:

1. bun run start:mock-update-server starts the mock update server. By default, it serves on localhost:3000 and out of ./release-mock at the project root. Both are configurable.
2. build-desktop-artifact.ts has two more options: (a) wether or not to build with mock updates, and (b) if so, which port to use. These options control two things: (c) wether or not to output to ./release-mock over ./release (the default) and (d) the manifest URL built into the built Electron app.
3. The same two options above are configurable at runtime on any Electron build.

When used normally, this functionality should work fine. However, users should be aware of the manifest URL's they cause to be built into the app and/or use runtime options to ensure they spin up the mock update server on the right port.

Why

This will help us when testing the update mechanisms.

UI Changes

N/A

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add mock update server for local desktop auto-update testing

• Adds scripts/mock-update-server.ts, a Bun-based static file server that serves update artifacts from release-mock/ at localhost:3000 (configurable via T3CODE_DESKTOP_MOCK_UPDATE_SERVER_PORT).
• When T3CODE_DESKTOP_MOCK_UPDATES is set, configureAutoUpdater in src/main.ts points electron-updater at the local server instead of GitHub.
• Extends scripts/build-desktop-artifact.ts with --mock-updates and --mock-update-server-port flags; mock builds output to release-mock/ and publish config targets the local server.
• Adds a start:mock-update-server npm script to launch the server.

^{Macroscope summarized 7f0c421.}

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