feat(server): Http4s server

Changed at how the run command starts TUI GUI and the server. This is neccessary so that TUI GUI and server start and the game from the TUI/GUI is registered in the server.

modules/ui/build.gradle.kts

@@ -64,6 +64,7 @@ dependencies {
     implementation(project(":modules:rule"))
     implementation(project(":modules:api"))
     implementation(project(":modules:io"))
+    implementation(project(":modules:server"))
 
     // ScalaFX dependencies
     implementation("org.scalafx:scalafx_3:${versions["SCALAFX"]!!}")

modules/ui/src/main/scala/de/nowchess/ui/Main.scala

@@ -1,21 +1,22 @@
 package de.nowchess.ui
 
 import de.nowchess.chess.engine.GameEngine
+import de.nowchess.server.ServerLauncher
 import de.nowchess.ui.terminal.TerminalUI
 import de.nowchess.ui.gui.ChessGUILauncher
 
 /** Application entry point - starts both GUI and Terminal UI for the chess game.
  *  Both views subscribe to the same GameEngine via Observer pattern.
+ *  The REST server shares the same engine instance, so API moves are reflected in the UI.
  */
 object Main:
   def main(args: Array[String]): Unit =
-    // Create the core game engine (single source of truth)
     val engine = new GameEngine()
+    val gameId = ServerLauncher.start(engine)
+    println(s"REST API ready — game ID: $gameId  →  http://localhost:8080/api/board/game/$gameId")
 
-    // Launch ScalaFX GUI in separate thread
     ChessGUILauncher.launch(engine)
 
-    // Create and start the terminal UI (blocks on main thread)
     val tui = new TerminalUI(engine)
     tui.start()