Rename: Tokyo Wangan Racing (was Fast & Furious: Tokyo Expressway)

- Title in README + GDD, UI/log prefixes FnF -> Wangan
- Rojo project name -> TokyoWanganRacing
- Fix undefined `H` in CarManager seat CFrame (selene error) -> Chassis.BODY_SIZE.Y

src/client/init.client.luau

@@ -53,7 +53,7 @@ local function corner(inst: Instance, radius: number)
 end
 
 local screen = make("ScreenGui", {
-	Name = "FnF_UI",
+	Name = "Wangan_UI",
 	ResetOnSpawn = false,
 	ZIndexBehavior = Enum.ZIndexBehavior.Sibling,
 }, playerGui)
@@ -296,4 +296,4 @@ respawnBtn.MouseButton1Click:Connect(function()
 	showToast("Respawning your car...")
 end)
 
-print("[FnF] Client UI ready (drive-only MVP).")
+print("[Wangan] Client UI ready (drive-only MVP).")