Fix/impl refactor (#14776)

* fix: impl refactor

* fix: unload/load python module, race conditions, freezes

* remove dead code

* remove extra hook

* remove more dead code

* fix gil run script

src/slic3r/plugin/PluginFsUtils.hpp

@@ -32,4 +32,20 @@ bool delete_plugin_root(const boost::filesystem::path& resolved_root,
                         const std::string& plugin_id,
                         std::string& error);
 
+// The directories plugins are discovered from: {data_dir}/orca_plugins, plus the per-user cloud
+// directory when cloud_user_id is non-empty.
+//
+// NOTE: this CREATES the directories if they do not exist. Callers rely on that side effect — the
+// install path writes into them without creating them itself.
+std::vector<std::string> get_plugin_directories(const std::string& cloud_user_id);
+
+// Scan the given directories for plugin packages (manifest-only; no Python is loaded, no state is
+// kept). Pure: directories in, descriptors out.
+//
+// Returns every package found, valid and invalid alike: a package whose manifest could not be
+// parsed comes back with metadata_valid == false and its error set (descriptor.is_invalid_package()).
+// The package-level auto-load flag is read from each package's .install_state.json into
+// descriptor.enabled. Capabilities are NOT discovered here — a package has none until it is loaded.
+std::vector<PluginDescriptor> discover_plugin_packages(const std::vector<std::string>& dirs, std::string& error);
+
 } // namespace Slic3r