Add admin-core frontend (Port 3008)

Next.js admin frontend for Core with 3 categories
(Communication, Infrastructure, Development), 13 modules,
2 roles (developer, ops), and 11 API proxy routes.
Includes docker-compose service and nginx SSL config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-core/app/globals.css

@@ -0,0 +1,68 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+/* Custom scrollbar */
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+::-webkit-scrollbar-track {
+  background: #f1f5f9;
+}
+
+::-webkit-scrollbar-thumb {
+  background: #cbd5e1;
+  border-radius: 4px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: #94a3b8;
+}
+
+/* Smooth transitions */
+* {
+  transition-property: background-color, border-color, color, fill, stroke;
+  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
+  transition-duration: 150ms;
+}
+
+/* Focus styles */
+*:focus-visible {
+  outline: 2px solid #0ea5e9;
+  outline-offset: 2px;
+}
+
+/* Category color utilities */
+@layer utilities {
+  .bg-category-communication {
+    @apply bg-communication-100;
+  }
+  .border-category-communication {
+    @apply border-communication-300;
+  }
+  .text-category-communication {
+    @apply text-communication-700;
+  }
+
+  .bg-category-infrastructure {
+    @apply bg-infrastructure-100;
+  }
+  .border-category-infrastructure {
+    @apply border-infrastructure-300;
+  }
+  .text-category-infrastructure {
+    @apply text-infrastructure-700;
+  }
+
+  .bg-category-development {
+    @apply bg-development-100;
+  }
+  .border-category-development {
+    @apply border-development-300;
+  }
+  .text-category-development {
+    @apply text-development-700;
+  }
+}