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, 5 insertions, 2 deletions

diff --git a/libs/plugin_python/src/proxy/proxypython.cpp b/libs/plugin_python/src/proxy/proxypython.cpp
index 196bf23..c9c7ba2 100644
--- a/libs/plugin_python/src/proxy/proxypython.cpp
+++ b/libs/plugin_python/src/proxy/proxypython.cpp
@@ -224,6 +224,9 @@ bool ProxyPython::init(IOrganizer* moInfo)
 
     if (!m_Runner || !m_Runner->isInitialized()) {
         m_LoadFailure = FailureType::INITIALIZATION;
+        MOBase::log::error("Python proxy: interpreter failed to initialize, "
+                           "Python plugins will be unavailable");
+        return true;  // return true so the plugin stays loaded (shows diagnostic)
     }
     else {
         m_Runner->addDllSearchPath(pluginDataRoot / "dlls");
@@ -296,7 +299,7 @@ QStringList ProxyPython::pluginList(const QDir& pluginPath) const
 
 QList<QObject*> ProxyPython::load(const QString& identifier)
 {
-    if (!m_Runner) {
+    if (!m_Runner || !m_Runner->isInitialized()) {
         return {};
     }
     return m_Runner->load(identifier);
@@ -304,7 +307,7 @@ QList<QObject*> ProxyPython::load(const QString& identifier)
 
 void ProxyPython::unload(const QString& identifier)
 {
-    if (m_Runner) {
+    if (m_Runner && m_Runner->isInitialized()) {
         return m_Runner->unload(identifier);
     }
 }