Remove AppImage build target and runtime references

We ship via portable tarball directory + .bin self-extracting installer
only; the AppImage path was unmaintained and pulling in linuxdeploy
tooling for a format we no longer publish.

Build:
- build.sh: drop appimage/all-includes-appimage modes (now: tarball,
  installer, all=both, shell). Output listing tracks the directory.
- docker/Dockerfile: drop BUILD_APPIMAGE arg and the linuxdeploy
  download/extract block.
- docker/build-inner.sh: drop build_appimage() (~120 lines), AppImage
  arm of the BUILD_MODE switch, *.AppImage summary listing.
- docker/AppRun.sh: deleted.
- .gitignore: drop *.AppImage / squashfs-root / *.flatpak entries.

Runtime: no longer key off APPIMAGE/APPDIR env vars or AppRun-set
state. The fluorine-manager launcher script already exports
FLUORINE_ORIG_*, MO2_BASE_DIR, MO2_PLUGINS_DIR, MO2_LIBS_DIR,
MO2_PYTHON_DIR for the same purpose, so simplify:
- envshortcut: appImageOrBinary -> launcherOrBinary; bundledFluorineIcon
  no longer probes APPDIR.
- nxmhandler: drop APPIMAGE-based wrapper path; use applicationFilePath.
- protonlauncher: rename cleanAppImageEnv -> cleanFluorineEnv, drop
  APPIMAGE/APPDIR/OWD/ARGV0/APPIMAGE_ORIGINAL_EXEC/DESKTOPINTEGRATION
  removals and .mount_Fluori pattern strip.
- prefixsetuprunner: same env-cleaning trim.
- utility, library.h, proxypython, mainwindow, moapplication, appconfig:
  comment cleanup pointing at the launcher instead of AppRun.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1 files changed, 1 insertions, 7 deletions

diff --git a/.gitignore b/.gitignore
index f247e19..1b7b4ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,9 +7,6 @@ build-container-2404-gcc14/
 # Rust build artifacts
 target/
 
-# AppImage build artifacts
-*.AppImage
-
 # Logs
 *.log
 
@@ -23,11 +20,8 @@ compile_commands.json
 .DS_Store
 Thumbs.db
 
-# AppImage extraction/build leftovers
-squashfs-root/
+# Build leftovers
 build-source/
-flatpak-repo/
-*.flatpak
 
 # Python bytecode
 __pycache__/