feat(registry): implement responsive UI with glassmorphism and header fix

public/plugins.json

@@ -0,0 +1,37 @@
+[
+    {
+        "id": "plugin-mivo-theme",
+        "name": "Mivo Theme Downloader",
+        "description": "Allows downloading the Captive Portal theme with auto-configuration.",
+        "version": "1.0.0",
+        "author": "DyzulkDev",
+        "category": "Hotspot Tools",
+        "scope": "Session",
+        "tags": [
+            "theme",
+            "downloader",
+            "hotspot",
+            "captive-portal"
+        ],
+        "repo": "https://github.com/mivodev/plugin-mivo-theme",
+        "download": "https://github.com/mivodev/plugin-mivo-theme/archive/refs/heads/main.zip",
+        "readme": "https://raw.githubusercontent.com/mivodev/plugin-mivo-theme/main/README.md"
+    },
+    {
+        "id": "plugin-backup-manager",
+        "name": "Backup Manager (Demo)",
+        "description": "Automated daily backups to Google Drive.",
+        "version": "2.1.0",
+        "author": "MivoTeam",
+        "category": "System Tools",
+        "scope": "Global",
+        "tags": [
+            "backup",
+            "security",
+            "cloud"
+        ],
+        "repo": "#",
+        "download": "#",
+        "readme": "#"
+    }
+]