fix: properly sync model selection dropdown in video generation UI (mudler#8680)

fix(video): initialize model selection dropdown with current model value

The Alpine.js link variable was starting empty, causing the dropdown
selection to not reflect the currently selected model. This fix initializes
the link variable with the current model value from the template (e.g.,
video/{{.Model}}), following the same pattern used in image.html.

Signed-off-by: localai-bot <localai-bot@users.noreply.github.com>
Co-authored-by: localai-bot <localai-bot@users.noreply.github.com>

Author: localai-bot

core/http/views/video.html

@@ -20,7 +20,7 @@
                         <div class="flex items-center justify-between gap-2">
                             <label class="text-xs font-medium text-[var(--color-text-secondary)] uppercase tracking-wide flex-shrink-0">Model</label>
                         </div>
-                        <select x-data="{ link : '' }" x-model="link" x-init="$watch('link', value => window.location = link)" 
+                        <select x-data="{ link : '{{if .Model}}video/{{.Model}}{{end}}' }" x-model="link" x-init="$watch('link', value => window.location = link)" 
                             id="model-select"
                             class="input w-full p-1.5 text-xs"
                         >