Separate bundle identifier and app icon for debug builds

[groundwater]

Problem

Debug and release builds of GhostVM use the same bundle identifier (org.ghostvm.ghostvm), so macOS treats them as the same app. You can't run both side by side during development.

Proposed Solution

Use a separate bundle identifier and app icon for debug builds so they can coexist with a release install:

• Bundle ID: org.ghostvm.ghostvm.debug (Debug) vs org.ghostvm.ghostvm (Release)
• Helper Bundle ID: org.ghostvm.ghostvm.helper.debug (Debug) vs org.ghostvm.ghostvm.helper (Release)
• Display name: "GhostVM Debug" in Dock/Launchpad for debug builds
• App icon: Visually distinct debug icon (e.g. badge overlay, different tint)

Implementation Notes

• Per-config overrides in project.yml (configs: Debug: block) for bundle ID and display name
• VMApp-Info.plist and GhostVMHelper/Info.plist use $(GHOSTVM_DISPLAY_NAME) variable instead of hardcoded "GhostVM"
• Makefile debug: target copies debug-specific icon files
• AppIconAdapter.swift needs no changes — icon files are named the same, just swapped at build time
• VM data in ~/Library/Application Support/GhostVM/ is shared (same VMs visible in both builds)
• API sockets keyed by VM name, not bundle ID — no conflict unless same VM booted in both simultaneously