feat: Remote Process Memory plugin, source menu icons, base address fix

- Remote Process Memory plugin: shared-memory IPC payload injected into
  target process (CreateRemoteThread on Win, ptrace+dlopen on Linux),
  VirtualQuery-based memory safety, PEB-based image base, batch reads
- Source dropdown: SVG icons per provider type, DLL filename shown
- Fix base address not updating when switching to a new source provider
- ProviderRegistry carries DLL filename from PluginManager

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

src/pluginmanager.cpp

@@ -92,7 +92,8 @@ bool PluginManager::LoadPlugin(const QString& path)
         IProviderPlugin* provider = static_cast<IProviderPlugin*>(plugin);
         QString name = QString::fromStdString(plugin->Name());
         QString identifier = name.toLower().replace(" ", "");
-        ProviderRegistry::instance().registerProvider(name, identifier, provider);
+        QString dllFileName = QFileInfo(path).fileName();
+        ProviderRegistry::instance().registerProvider(name, identifier, provider, dllFileName);
     }
     
     return true;