feat: Archivum skeleton — Go/GraphQL backend + Vue 3 PWA frontend

Full project scaffold: multi-stage Dockerfile (ARM64/AMD64), AsciiDoc↔TipTap
bridge, Setup Wizard, CodeMirror source editor, Git-backed storage layer,
LDAP+JWT auth skeleton, Tailwind mobile-first layout, and VS Code build/push
tasks targeting registry at 192.168.0.19:5000.

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

frontend/tailwind.config.js

@@ -0,0 +1,23 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: ['./index.html', './src/**/*.{vue,js,ts,jsx,tsx}'],
+  darkMode: 'class',
+  theme: {
+    extend: {
+      fontFamily: {
+        sans: ['Inter', 'ui-sans-serif', 'system-ui'],
+        mono: ['JetBrains Mono', 'ui-monospace', 'monospace'],
+      },
+      colors: {
+        surface: {
+          50:  '#f8fafc',
+          100: '#f1f5f9',
+          800: '#1e293b',
+          900: '#0f172a',
+          950: '#020617',
+        },
+      },
+    },
+  },
+  plugins: [],
+}