feat(bovine) : placeholder onglet Santé

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

frontend/pages/bovine/[id].vue

@@ -146,6 +146,12 @@
                 </div>
             </div>
         </div>
+
+        <div v-show="activeTab === 'sante'">
+            <div class="border-2 border-dashed border-primary-500 rounded-md py-16 text-center text-primary-500 font-bold uppercase text-2xl">
+                À venir
+            </div>
+        </div>
     </div>
 </template>