test: add Inertia tests and demo

[goravel-coder]

Summary

• Adds the Inertia integration — github.com/goravel/inertia dependency, service-provider registration, and generated facades.Inertia() facade — so apps can build server-driven Inertia pages with Goravel.
• Ships a committed, installer-independent demo frontend (Vue 3 + Vite/TypeScript toolchain under resources/inertia/, official Goravel favicon, static asset routes) wired to /inertia/* routes covering deferred/merged props, session flash + validation errors, redirects, and location responses; the demo renders out of the box after go run ., and the page is viewable after running npm run dev (HMR) or npm run build (production bundle served from the gitignored public/build).
• Adds two test suites: an HTTP suite (8 tests) exercising the full Inertia protocol including full-page vs JSON responses and version-mismatch 409 conflicts, and an installer suite verifying inertia:install scaffolding generation and committed-state restore (including removing the installer-generated public/favicon.png in teardown).

Why

This PR brings Inertia into the example repository as a first-class, copyable demonstration: it installs the package (dependency + provider + generated facade), wires a complete demo through config/inertia.go, a root template, an Inertia() middleware, a controller, and an /inertia/* route group, and commits the Vue 3/Vite frontend so framework users can run the demo immediately without the installer. Static /public and /build routes serve the favicon and production Vite manifest assets, while the goravelHot Vite plugin writes/removes public/hot for zero-config HMR during development.

The behavior is locked in with tests: the HTTP suite drives the full Inertia protocol (full-page HTML vs X-Inertia JSON, version-mismatch conflicts, deferred/merged props, session flash and validation errors, redirects, and location), and the installer suite runs inertia:install end-to-end and restores the committed toolchain and demo so the tree stays clean.

// routes/web.go
facades.Route().Middleware(appmiddleware.Inertia()).Prefix("inertia").Group(func(router route.Router) {
	inertiaController := controllers.NewInertiaController()
	router.Get("home", inertiaController.Home)
	router.Get("feed", inertiaController.Feed)
	router.Get("contact", inertiaController.Contact)
	router.Post("contact", inertiaController.StoreContact)
	router.Get("redirect", inertiaController.RedirectTo)
	router.Delete("redirect", inertiaController.RedirectTo)
	router.Get("location", inertiaController.LocationTo)
})

// app/http/controllers/inertia_controller.go
func (r *InertiaController) Home(ctx http.Context) http.Response {
	facades.Inertia().Defer(ctx, "stats", func() any { return map[string]any{"users": 1280} })
	return facades.Inertia().Render(ctx, "Welcome", map[string]any{"message": "Goravel + Inertia"})
}

func (r *InertiaController) StoreContact(ctx http.Context) http.Response {
	validator, err := ctx.Request().Validate(map[string]any{"email": "required|email"})
	if err != nil || validator.Fails() {
		if validator != nil {
			facades.Inertia().FlashErrors(ctx, validator.Errors())
		}
		return facades.Inertia().Redirect(ctx, "/inertia/contact")
	}
	ctx.Request().Session().Flash("success", "Saved!")
	return facades.Inertia().Redirect(ctx, "/inertia/contact")
}

[hwbrzzl]

You can use https://github.com/goravel/docs/blob/master/public/favicon.ico

[hwbrzzl]

Will the folder be generated in the repo? If no, why need this line?

[hwbrzzl]

Add an annotation, similar to: If you actually want to visit the page, npm run dev should be run in advance.