Add API endpoints for stats and audits, implement data collection functions, and enhance index view with skeleton context

static/js/utils.js

@@ -1,3 +1,13 @@
+// Format bytes to GB (matches Django convert_bytes filter default)
+function formatBytes(bytes, targetUnit = 'GB') {
+    if (bytes == null || isNaN(Number(bytes))) return '0';
+    const b = Number(bytes);
+    const factors = { B: 1, KB: 1024, MB: 1024 * 1024, GB: 1024 ** 3, TB: 1024 ** 4 };
+    const unit = (targetUnit || 'GB').toUpperCase();
+    const factor = factors[unit] || factors.GB;
+    return (b / factor).toFixed(1);
+}
+
 // Color utilities
 const getCSSVar = (varName) => {
     return getComputedStyle(document.documentElement).getPropertyValue(varName).trim();