feat(models): show Civitai model/version ids in model modal, always-on hash/id search

- Model modal hash footnote now shows Civitai model id and version id
  (right-aligned, quick-copy buttons); hidden for non-Civitai models
- Hash/id exact search (sha256/autov2/autov3/civitai ids) is now always
  on: the search-options "hash" toggle is removed and the search_hash
  query param is silently ignored for API compatibility
- Footnote render condition relaxed so autov3-only and id-only models
  still show the line
- i18n: 4 new keys translated in all 9 locales; filters.hash key removed

py/routes/handlers/model_handlers.py

@@ -387,7 +387,6 @@ class ModelListingHandler:
             == "true",
             "tags": request.query.get("search_tags", "false").lower() == "true",
             "creator": request.query.get("search_creator", "false").lower() == "true",
-            "hash": request.query.get("search_hash", "false").lower() == "true",
             "recursive": request.query.get("recursive", "true").lower() == "true",
         }