Add icon and jarCreatedAt fields to plugin descriptors and responses; capture JAR creation time in PluginLoader (with content-type probe and improved logging) and include it in built PluginDescriptor. Update PluginMetadata to accept an icon. Improve URLClassLoader and toArray usages. Expose basePath and pluginsPath in ConfigController. Frontend: remove PluginExplorerModal, add a Plugins section in settings (PluginSection) and wire it into nav; enhance PluginRegistry to build icon URLs, include minHostVersion and jarCreatedAt, and normalize plugin data using app baseUrl; update ToolPicker to render plugin icons and UI tweaks. Misc: small UI/refactor changes and debug logging adjustments.