dingchenhui0618-arch/dsh-market-sidebar

Adds the dshmarket plugin market to the DSH sidebar as a panel of its own, ordered above the built-in Plugins entry. Clicking the entry renders the market through the client service dshmarket publishes for hosts, so the catalog, category filters, comments and install and update flows are the ones dshmarket ships rather than a copy of them. Nothing to learn or configure: the panel is the market, with its own sidebar entry, label in Chinese or English to match the interface language, and icon. If dshmarket is not loaded the panel says so instead of failing client composition, and its locale keys, slots and style tag are released when the plugin unloads.