refactor : merge Inventory_frontend submodule into frontend/ directory

Merges the full git history of Inventory_frontend into the monorepo
under frontend/. Removes the submodule in favor of a unified repo.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/app/middleware/profile.global.ts

@@ -0,0 +1,33 @@
+import { useProfileSession, usePermissions } from "#imports";
+
+export default defineNuxtRouteMiddleware(async (to) => {
+  const { ensureSession, activeProfile } = useProfileSession();
+  await ensureSession();
+
+  const rawPath = to?.path ?? "";
+  const normalizedPath = rawPath.startsWith("/") ? rawPath : `/${rawPath}`;
+  const fullPath = to?.fullPath ?? normalizedPath;
+  const routeName = typeof to?.name === "string" ? to.name : "";
+  const isProfilesRoute =
+    normalizedPath.startsWith("/profiles") ||
+    fullPath.startsWith("/profiles") ||
+    routeName.startsWith("profiles");
+
+  // Redirect to login if no active profile
+  if (!activeProfile.value && !isProfilesRoute) {
+    return navigateTo("/profiles");
+  }
+
+  // Permission checks
+  if (activeProfile.value) {
+    const { isAdmin } = usePermissions();
+
+    // Admin-only routes
+    if (normalizedPath.startsWith("/admin")) {
+      if (!isAdmin.value) {
+        return navigateTo("/");
+      }
+    }
+
+  }
+});