cleanup: move some logic out of kernel Main.cpp into separate files/functions

kernel/src/Drivers/Init.hpp

@@ -0,0 +1,17 @@
+/*
+    * Init.hpp
+    * Driver initialization orchestration
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#pragma once
+
+namespace Drivers {
+
+    // Initialize Intel GPU driver and update the cursor framebuffer if found.
+    void InitializeGraphics();
+
+    // Initialize network driver (E1000, falling back to E1000E) and the net stack.
+    void InitializeNetwork();
+
+}