fix(shadcn): isolate Nexus CSS vars with --nx- prefix + admin password reset endpoint

frontend/src/App.vue

@@ -7,6 +7,7 @@ import { useAuthStore } from './stores/auth'
 import AppSidebar from './components/layout/AppSidebar.vue'
 import AppHeader from './components/layout/AppHeader.vue'
 import ModuleView from './components/ModuleView.vue'
+import ToastContainer from './components/ui/ToastContainer.vue'
 
 const store = useOperationsStore()
 const auth = useAuthStore()
@@ -82,32 +83,11 @@ onMounted(() => {
         </template>
       </section>
     </main>
+    <ToastContainer />
   </div>
 </template>
 
 <style scoped>
-:root {
-  --bg: #0b0d13;
-  --panel: #11141b;
-  --line: #1f2330;
-  --accent: #7b6ef2;
-  --accent-soft: rgba(123,110,242,.08);
-  --text: #e8eaf0;
-  --text-dim: #6f7889;
-  --green: #27ae60;
-  --red: #e74c3c;
-  --yellow: #f1c40f;
-  --orange: #e67e22;
-}
-
-* { margin: 0; padding: 0; box-sizing: border-box; }
-html { font-size: 15px; }
-body {
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
-  background: var(--bg);
-  color: var(--text);
-  -webkit-font-smoothing: antialiased;
-}
 .shell {
   display: flex;
   height: 100vh;
@@ -135,12 +115,12 @@ main {
   gap: 12px;
 }
 .page-heading h1 { margin: 0; font-size: 18px; }
-.page-heading p { margin: 4px 0 0; font-size: 10px; color: var(--text-dim); }
+.page-heading p { margin: 4px 0 0; font-size: 10px; color: var(--nx-text-dim); }
 .eyebrow {
   font-size: 8.5px;
   font-weight: 700;
   letter-spacing: .12em;
-  color: var(--accent);
+  color: var(--nx-accent);
   text-transform: uppercase;
 }
 .refresh {
@@ -149,15 +129,15 @@ main {
   gap: 5px;
   flex-shrink: 0;
   padding: 6px 11px;
-  border: 1px solid var(--line);
+  border: 1px solid var(--nx-line);
   border-radius: 6px;
   background: transparent;
-  color: var(--text-dim);
+  color: var(--nx-text-dim);
   font-size: 9px;
   cursor: pointer;
   transition: background .15s;
 }
-.refresh:hover { background: var(--accent-soft); color: #d8dbe3; }
+.refresh:hover { background: var(--nx-accent-soft); color: #d8dbe3; }
 
 .spin { animation: spin 1s linear infinite; }
 @keyframes spin { to { transform: rotate(360deg); } }