feat(cabana): plugin updates and marketplace search on the Plugins screen

- GET /plugins looks up each versioned plugin's releases through
  kiosk.Client and applies plugin:update's rule (NewestCompatible above
  the BaseVersion), with the update command and the framework a newer
  release needs
- GET /plugins/marketplace forwards q and category (validated like the
  registry), marks installed and incompatible plugins and returns the
  install command; ids outside the plugin ID shape are dropped
- 4 s per-call timeout, at most 4 lookups at once, in-process cache
  (searches 5 min, releases 15 min, failures 1 min); a failing registry
  gives status unavailable, an empty plugins.registry_url sends nothing
- SPA: update badges and Marketplace tab with copy buttons (clipboard
  fallback), hidden when the registry is disabled; no install button
- OpenAPI, SPA types, inventories, conformance case, en/pl strings, docs

modules/phrasebook/backend/lang/en/lang.yaml

@@ -560,6 +560,23 @@ plugins:
   no_version: "No version"
   empty: "No plugins are installed."
   load_failed: "The plugin list could not be loaded."
+  registry_unavailable: "The plugin registry is not answering, so update information and the marketplace are unavailable for now."
+  update_available: "Update to :version available"
+  needs_framework: "A newer release needs framework :version."
+  command_label: "Command"
+  copy: "Copy"
+  copied: "Copied"
+  copied_announce: "Command copied to the clipboard."
+  copy_failed: "Copying failed. The command is selected; copy it with Ctrl+C."
+  search_label: "Search plugins"
+  search_placeholder: "Search by name or description"
+  category_label: "Category"
+  category_all: "All categories"
+  install_hint: "Plugins are installed and updated from the command line: run the command in the application's directory, then summer build, and deploy the new binary."
+  marketplace_empty: "No plugins match."
+  marker_installed: "Installed"
+  marker_needs_framework: "Needs framework :version"
+  featured: "Featured"
 permissions:
   tab_system: "System"
   manage_users: "Manage administrators"

modules/phrasebook/backend/lang/pl/lang.yaml

@@ -596,6 +596,23 @@ plugins:
   no_version: "Brak wersji"
   empty: "Brak zainstalowanych wtyczek."
   load_failed: "Nie udało się wczytać listy wtyczek."
+  registry_unavailable: "Katalog wtyczek nie odpowiada, więc informacje o aktualizacjach i katalog są chwilowo niedostępne."
+  update_available: "Dostępna aktualizacja do :version"
+  needs_framework: "Nowsze wydanie wymaga frameworka :version."
+  command_label: "Polecenie"
+  copy: "Kopiuj"
+  copied: "Skopiowano"
+  copied_announce: "Skopiowano polecenie do schowka."
+  copy_failed: "Nie udało się skopiować. Polecenie jest zaznaczone; skopiuj je skrótem Ctrl+C."
+  search_label: "Szukaj wtyczek"
+  search_placeholder: "Szukaj po nazwie lub opisie"
+  category_label: "Kategoria"
+  category_all: "Wszystkie kategorie"
+  install_hint: "Wtyczki instaluje się i aktualizuje z wiersza poleceń: uruchom polecenie w katalogu aplikacji, potem summer build, i wdróż nowy plik binarny."
+  marketplace_empty: "Brak pasujących wtyczek."
+  marker_installed: "Zainstalowana"
+  marker_needs_framework: "Wymaga frameworka :version"
+  featured: "Wyróżniona"
 permissions:
   tab_system: "System"
   manage_users: "Zarządzanie administratorami"