docs: reorganize documentation with i18n and Swagger API reference

- Add per-submodule docs structure (server-core, dashboard-ui, device-agent)
- Restructure VitePress with i18n support (Indonesian default + English)
- Add Swagger API reference pages with Swagger UI CDN embed
- Create merge.js script for combining sidebar manifests
- Integrate docs build into Docker (update.sh + nginx volume mount)
- Add documentation section to root README

apps/docs/.vitepress/config.mts

@@ -1,22 +1,50 @@
 import { defineConfig } from 'vitepress'
 
+// Sidebar manifests from submodules
+import serverCoreSidebar from '../../server-core/docs/sidebar.json'
+import dashboardSidebar from '../../dashboard-ui/docs/sidebar.json'
+import agentSidebar from '../../device-agent/docs/sidebar.json'
+
 export default defineConfig({
-  title: 'NexusGuard Docs',
-  description: 'Enterprise Zero-Trust SD-WAN Documentation',
+  title: 'NexusGuard',
+  description: 'Enterprise Zero-Trust SD-WAN Suite',
+  base: '/docs/',
   cleanUrls: true,
-  themeConfig: {
-    sidebar: [
-      {
-        text: 'Guides',
-        items: [
-          { text: 'Sign In', link: '/guides/sign-in' },
-          { text: 'Access Remote Server', link: '/guides/access-remote-server' },
-          { text: 'Add WireGuard Configuration', link: '/guides/add-wireguard-configuration' },
-          { text: 'Peers', link: '/guides/peers' },
-          { text: 'Email Service', link: '/guides/email-service' },
-          { text: 'WebHooks', link: '/guides/webhooks' },
-        ]
-      }
-    ]
-  }
+
+  locales: {
+    root: {
+      label: 'Bahasa Indonesia',
+      lang: 'id',
+      themeConfig: {
+        sidebar: [
+          serverCoreSidebar,
+          dashboardSidebar,
+          agentSidebar,
+        ],
+        nav: [
+          { text: 'Beranda', link: '/' },
+          { text: 'Panduan', link: '/guides/' },
+          { text: 'API', link: '/api/' },
+          { text: 'GitHub', link: 'https://git.datadunia.com/nexusguard/Nexus-Guard-Suite' },
+        ],
+      },
+    },
+    en: {
+      label: 'English',
+      lang: 'en',
+      themeConfig: {
+        sidebar: [
+          serverCoreSidebar,
+          dashboardSidebar,
+          agentSidebar,
+        ],
+        nav: [
+          { text: 'Home', link: '/en/' },
+          { text: 'Guides', link: '/en/guides/' },
+          { text: 'API', link: '/en/api/' },
+          { text: 'GitHub', link: 'https://git.datadunia.com/nexusguard/Nexus-Guard-Suite' },
+        ],
+      },
+    },
+  },
 })

apps/docs/en/api/index.md

@@ -0,0 +1,32 @@
+# NexusGuard API Reference
+
+This page provides interactive documentation for the NexusGuard Server Core API.
+
+<div id="swagger-ui"></div>
+
+<script setup>
+import { onMounted } from 'vue'
+
+onMounted(() => {
+  // Load Swagger UI from CDN
+  const script = document.createElement('script')
+  script.src = 'https://unpkg.com/swagger-ui-dist@5/swagger-ui-bundle.js'
+  script.onload = () => {
+    window.SwaggerUIBundle({
+      url: '/server-core/docs/swagger.json',
+      dom_id: '#swagger-ui',
+      presets: [
+        window.SwaggerUIBundle.presets.apis,
+        window.SwaggerUIBundle.SwaggerUIStandalonePreset
+      ],
+      layout: 'BaseLayout'
+    })
+  }
+  document.head.appendChild(script)
+  
+  const link = document.createElement('link')
+  link.rel = 'stylesheet'
+  link.href = 'https://unpkg.com/swagger-ui-dist@5/swagger-ui.css'
+  document.head.appendChild(link)
+})
+</script>

apps/docs/id/api/index.md

@@ -0,0 +1,31 @@
+# Referensi API NexusGuard
+
+Halaman ini menyediakan dokumentasi interaktif untuk API Server Core NexusGuard.
+
+<div id="swagger-ui"></div>
+
+<script setup>
+import { onMounted } from 'vue'
+
+onMounted(() => {
+  const script = document.createElement('script')
+  script.src = 'https://unpkg.com/swagger-ui-dist@5/swagger-ui-bundle.js'
+  script.onload = () => {
+    window.SwaggerUIBundle({
+      url: '/server-core/docs/swagger.json',
+      dom_id: '#swagger-ui',
+      presets: [
+        window.SwaggerUIBundle.presets.apis,
+        window.SwaggerUIBundle.SwaggerUIStandalonePreset
+      ],
+      layout: 'BaseLayout'
+    })
+  }
+  document.head.appendChild(script)
+  
+  const link = document.createElement('link')
+  link.rel = 'stylesheet'
+  link.href = 'https://unpkg.com/swagger-ui-dist@5/swagger-ui.css'
+  document.head.appendChild(link)
+})
+</script>

apps/docs/merge.js

@@ -0,0 +1,26 @@
+import { readFileSync } from 'node:fs';
+import { join, dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+const submodules = [
+  { name: 'server-core', path: '../server-core/docs/sidebar.json' },
+  { name: 'dashboard-ui', path: '../dashboard-ui/docs/sidebar.json' },
+  { name: 'device-agent', path: '../device-agent/docs/sidebar.json' }
+];
+
+const sidebar = [];
+
+for (const mod of submodules) {
+  const filePath = join(__dirname, mod.path);
+  try {
+    const content = JSON.parse(readFileSync(filePath, 'utf-8'));
+    sidebar.push(content);
+    console.error(`\u2713 Loaded ${mod.name}`);
+  } catch (e) {
+    console.error(`\u26A0 Skipping ${mod.name}: ${e.message}`);
+  }
+}
+
+console.log(JSON.stringify(sidebar, null, 2));