Add Python init diagnostics, AppImage build system, misc Linux fixes

- python: switch Py_InitializeEx → Py_InitializeFromConfig for explicit
  error reporting; add dladdr + fprintf diagnostics to trace which DSO
  Python symbols resolve to and whether Py_IsInitialized succeeds
- python: log RTLD_NOLOAD vs fresh-load outcome when promoting libpython
  to RTLD_GLOBAL
- build: add Docker-based AppImage build script (build.sh), update
  Dockerfile and build-inner.sh for AppImage-only workflow
- build: remove Flatpak support entirely; move AppImage metadata
  (desktop/metainfo/icon) from flatpak/ to data/
- Add Monster Hunter Wilds basic_games plugin
- .gitignore: exclude squashfs-root, build-source, flatpak-repo,
  __pycache__, fomod-plus-settings.ini
- Various Linux port fixes across wineprefix, processrunner, proton
  launcher, FUSE connector, instance manager, download manager,
  sanitychecks, and NaK Rust paths/runtime_wrap

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/data/com.fluorine.manager.desktop b/data/com.fluorine.manager.desktop
new file mode 100644
index 0000000..ff62c76
--- /dev/null
+++ b/data/com.fluorine.manager.desktop
@@ -0,0 +1,22 @@
+[Desktop Entry]
+Type=Application
+Name=Fluorine Manager
+GenericName=Mod Manager
+Comment=Mod Organizer 2 for Linux - manage your game mods
+Exec=fluorine-manager
+Icon=com.fluorine.manager
+Terminal=false
+Categories=Game;Utility;
+Keywords=mod;organizer;modding;skyrim;fallout;
+MimeType=x-scheme-handler/nxm;
+Actions=create-portable;list-instances;
+
+[Desktop Action create-portable]
+Name=Create Portable Instance
+Exec=fluorine-manager create-portable
+Icon=com.fluorine.manager
+
+[Desktop Action list-instances]
+Name=List Instances
+Exec=fluorine-manager list-instances
+Icon=com.fluorine.manager