Ghostty-per-Projekt-Builder: Template + make/rebuild-Skripte

- ghostty-template/Ghostty.app: lokal gebautes Ghostty v1.3.1 mit DockTilePlugin-Patch
  (eigenes Dock-Icon ueber Contents/Resources/DockIcon.png)
- make-ghostty-app.sh: erzeugt pro Projekt eine App; Slots fuer
  icon/workdir/command/theme/bg/fg/font/font-size
- rebuild-template.sh: baut Template lokal neu (nur Xcode, kein Zig/VM),
  gepinnt auf vendor/libghostty v1.3.1
- ghostty-template/dock-icon.patch: der DockTilePlugin-Patch
- icons/robotunits.png
- enthaelt zudem die vorausgehende MiniTerm/libghostty-Integration

ghostty-template/dock-icon.patch

@@ -0,0 +1,20 @@
+diff --git a/macos/Sources/Features/Custom App Icon/DockTilePlugin.swift b/macos/Sources/Features/Custom App Icon/DockTilePlugin.swift
+index 990cd8b..6cf7031 100644
+--- a/macos/Sources/Features/Custom App Icon/DockTilePlugin.swift	
++++ b/macos/Sources/Features/Custom App Icon/DockTilePlugin.swift	
+@@ -51,6 +51,15 @@ class DockTilePlugin: NSObject, NSDockTilePlugIn {
+             return
+         }
+ 
++        // Custom per-project dock icon: if the enclosing app bundle ships a
++        // Resources/DockIcon.png, use it verbatim and skip the ghost logic.
++        if let appURL = ghosttyAppURL,
++           let img = NSImage(contentsOf: appURL.appendingPathComponent("Contents/Resources/DockIcon.png")) {
++            dockTile.setIcon(img)
++            iconChangeObserver = nil
++            return
++        }
++
+         // Try to restore the previous icon on launch.
+         iconDidChange(ghosttyUserDefaults.appIcon, dockTile: dockTile)
+