[mod] client/simple: client plugins (#5406)

* [mod] client/simple: client plugins

Defines a new interface for client side *"plugins"* that coexist with server
side plugin system. Each plugin (e.g., `InfiniteScroll`) extends the base
`ts Plugin`. Client side plugins are independent and lazy‑loaded via `router.ts`
when their `load()` conditions are met. On each navigation request, all
applicable plugins are instanced.

Since these are client side plugins, we can only invoke them once DOM is fully
loaded. E.g. `Calculator` will not render a new `answer` block until fully
loaded and executed.

For some plugins, we might want to handle its availability in `settings.yml`
and toggle in UI, like we do for server side plugins. In that case, we extend
`py Plugin` instancing only the information and then checking client side if
[`settings.plugins`](https://github.com/inetol/searxng/blob/1ad832b1dc33f3f388da361ff2459b05dc86a164/client/simple/src/js/toolkit.ts#L134)
array has the plugin id.

* [mod] client/simple: rebuild static

1 files changed, 0 insertions, 3 deletions

diff --git a/searx/templates/simple/preferences.html b/searx/templates/simple/preferences.html
index 87bd99c45..ca3a3f087 100644
--- a/searx/templates/simple/preferences.html
+++ b/searx/templates/simple/preferences.html
@@ -211,9 +211,6 @@
     {%- if 'results_on_new_tab' not in locked_preferences -%}
       {%- include 'simple/preferences/results_on_new_tab.html' -%}
     {%- endif -%}
-    {%- if 'infinite_scroll' not in locked_preferences -%}
-      {%- include 'simple/preferences/infinite_scroll.html' -%}
-    {%- endif -%}
     {%- if 'search_on_category_select' not in locked_preferences -%}
       {%- include 'simple/preferences/search_on_category_select.html' -%}
     {%- endif -%}