feat(ml): support multiple urls (#14347)

* support multiple url

* update api

* styling

unnecessary `?.`

* update docs, make new url field go first

add load balancing section

* update tests

doc formatting

wording

wording

linting

* small styling

* `url` -> `urls`

* fix tests

* update docs

* make docusaurus happy

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

i18n/en.json

@@ -25,6 +25,7 @@
   "add_to": "Add to...",
   "add_to_album": "Add to album",
   "add_to_shared_album": "Add to shared album",
+  "add_url": "Add URL",
   "added_to_archive": "Added to archive",
   "added_to_favorites": "Added to favorites",
   "added_to_favorites_count": "Added {count, number} to favorites",
@@ -132,7 +133,7 @@
     "machine_learning_smart_search_description": "Search for images semantically using CLIP embeddings",
     "machine_learning_smart_search_enabled": "Enable smart search",
     "machine_learning_smart_search_enabled_description": "If disabled, images will not be encoded for smart search.",
-    "machine_learning_url_description": "URL of the machine learning server",
+    "machine_learning_url_description": "The URL of the machine learning server. If more than one URL is provided, each server will be attempted one-at-a-time until one responds successfully, in order from first to last.",
     "manage_concurrency": "Manage Concurrency",
     "manage_log_settings": "Manage log settings",
     "map_dark_style": "Dark style",
@@ -1045,6 +1046,7 @@
   "remove_from_album": "Remove from album",
   "remove_from_favorites": "Remove from favorites",
   "remove_from_shared_link": "Remove from shared link",
+  "remove_url": "Remove URL",
   "remove_user": "Remove user",
   "removed_api_key": "Removed API Key: {name}",
   "removed_from_archive": "Removed from archive",