dsh-plugin-catalog: Upgrade DSH Web GUI plugin page to a plugin catalog

# Foreword The philosophy of DSH is "everything is a plugin." After installing a large number of third-party plugins, the built-in "plugin list" within the Web GUI Settings page becomes insufficient: to verify if a plugin is third-party, determine where it is mounted, or understand its specific function, one must consult additional documentation. The dsh-plugin-catalog introduced below addresses this issue—it upgrades the Settings → Plugins page into a plugin catalog, supplementing third-party badges, mount point aggregation, and bilingual (Chinese and English) descriptions, without altering the plugin's installation and management mechanisms. # What is this? dsh-plugin-catalog is a DeepSeek Harness (DSH) Web GUI plugin maintained by LuniteGlaze, current version...