fix(other-models): make clip_vision opt-in like controlnet

DEFAULT_ENABLED_OTHER_SUB_TYPES managed vae, upscaler, text_encoder and
clip_vision while controlnet was the sole opt-in type. That split was not
defensible on demand breadth: ControlNet is the broader category by install
base, and clip_vision is the narrower one (IPAdapter/SVD image conditioning,
usually one to three files) whose CivitAI type is retired upstream.

Keep the default set to the dependency-style assets every pipeline needs and
where "which one am I actually using" is the real problem - VAE, upscalers
and text encoders - and treat clip_vision and controlnet symmetrically as
opt-in. The feature is still unreleased, so the change needs no migration.

- Sync all five surfaces holding a default: DEFAULT_ENABLED_OTHER_SUB_TYPES,
  DEFAULT_SETTINGS, both DEFAULT_SETTINGS_BASE/createDefaultSettings lists,
  updateOtherModelsControls()'s fallback and the Jinja fallback.
- The selection is persisted per user, so only the untouched default moves;
  existing default_other_roots entries for a disabled sub_type are preserved.
- Fix the Jinja fallback using `or`, which treated an all-unchecked empty
  allow-list as "unset" and re-checked every box on render; `is none` keeps
  the empty list empty.
- Document the revised defaults and rationale in the plan.

Tests assert the new default trio, the normalize fallback, that both opt-in
types stay out of the default scan, and the auto-set iteration test now
enables clip_vision explicitly since it exercises the loop, not the default.

static/js/managers/SettingsManager.js

@@ -2429,7 +2429,7 @@ export class SettingsManager {
         const enableOtherModels = !!state.global.settings.enable_other_models;
         const enabledSubTypes = new Set(
             state.global.settings.enabled_other_sub_types
-            || ['vae', 'upscaler', 'text_encoder', 'clip_vision']
+            || ['vae', 'upscaler', 'text_encoder']
         );
 
         document.querySelectorAll('[data-other-subtype-toggle]').forEach((input) => {