fix(adminapi): drop invalid hx-include="none" from assign buttons

htmx treats hx-include's value as a CSS selector; "none" isn't a selector
and htmx logs a warning on every matching element. The assign buttons
sit outside any <form>, so htmx wouldn't pull in extra fields anyway —
the attribute was a defensive no-op that turned into console noise.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Alexey Panfilov

internal/adminapi/templates/partials_models_row.html

@@ -11,8 +11,7 @@
                 hx-post="/slots/{{.Name}}/assign"
                 hx-vals='{"model_id":"{{$modelID}}"}'
                 hx-target="#routing-section"
-                hx-swap="innerHTML"
-                hx-include="none">
+                hx-swap="innerHTML">
           {{if eq .ModelID $modelID}}✓ {{end}}→ {{.Name}}
         </button>
         {{end}}