fix: send template_id as query param (not JSON body) for glossary import

The backend expects template_id as a Query parameter, but the frontend
was sending it as a JSON body — causing validation error on every click.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/app/dashboard/translate/GlossarySelector.tsx

@@ -85,10 +85,9 @@ export function GlossarySelector({ sourceLang, targetLang, isPro, glossaryId, on
     setImportingId(template.id);
     setError(null);
     try {
-      const res = await fetch(`${API_BASE}/api/v1/glossaries/import`, {
+      const res = await fetch(`${API_BASE}/api/v1/glossaries/import?template_id=${encodeURIComponent(template.id)}`, {
         method: 'POST',
         headers,
-        body: JSON.stringify({ template_id: template.id }),
       });
 
       if (res.ok) {