fix: Use POST for library status API call

dist/adastra-vtl-installer/VERSION

@@ -1,4 +1,4 @@
 Adastra VTL Installer
 Version: 1.0.0
-Build Date: 2025-12-10 14:36:24
+Build Date: 2025-12-10 14:40:16
 Build Host: vtl-dev

dist/adastra-vtl-installer/web-ui/script.js

@@ -1959,7 +1959,13 @@ function loadLibraryStatus() {
     container.style.display = 'none';
     errorEl.style.display = 'none';
 
-    fetch('api.php?action=library_status')
+    fetch('api.php', {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json'
+        },
+        body: JSON.stringify({ action: 'library_status' })
+    })
         .then(response => response.json())
         .then(data => {
             loading.style.display = 'none';

web-ui/script.js

@@ -1959,7 +1959,13 @@ function loadLibraryStatus() {
     container.style.display = 'none';
     errorEl.style.display = 'none';
 
-    fetch('api.php?action=library_status')
+    fetch('api.php', {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json'
+        },
+        body: JSON.stringify({ action: 'library_status' })
+    })
         .then(response => response.json())
         .then(data => {
             loading.style.display = 'none';