feat: initialize warpbox.dev project structure and backend

Initialize the repository with the core Go backend architecture and a frontend mockup for warpbox.dev, a self-hosted file-sharing application.

- Set up Go backend modules for configuration, HTTP server, middleware, handlers, and templates.
- Add local development scripts, environment templates, and basic project configuration.
- Include a React-based frontend mockup under the docs directory.

docs/Mock-Up/Mockup Magic/bunfig.toml

@@ -0,0 +1,6 @@
+[install]
+# 24h supply-chain guard: skip package versions published less than a day ago.
+minimumReleaseAge = 86400
+# Each entry bypasses the 24h guard for one package — confirm with the user
+# before adding any.
+minimumReleaseAgeExcludes = ["@lovable.dev/vite-tanstack-config"]