feat: optimize JSON sync with 1 API call + raw URLs

- Replace GitHub API calls (390+) with 1 API call + raw URL downloads
- Create GitHubJsonService for efficient JSON file syncing
- Reduce API rate limiting issues by 99.7%
- Add automatic page reload after successful sync
- Update tests to use new service
- Maintain same functionality with better performance

Performance improvement:
- Before: 390+ GitHub API calls (1 per JSON file)
- After: 1 GitHub API call + 389 raw URL downloads
- Raw URLs have no rate limits, making sync much more reliable

scripts/json/stylus.json

@@ -0,0 +1,35 @@
+{
+  "name": "Stylus",
+  "slug": "stylus",
+  "categories": [
+    4
+  ],
+  "date_created": "2025-09-12",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": 8000,
+  "documentation": "https://mmastrac.github.io/stylus/",
+  "website": "https://github.com/mmastrac/stylus",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons/webp/stylus.webp",
+  "config_path": "/opt/stylus/config.yaml",
+  "description": "Stylus (style + status) is a lightweight status page for infrastructure and networks. Configure a set of bash scripts that test the various parts of your infrastructure, set up visualizations with minimal configuration, and Stylus will generate you a dashboard for your system.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/stylus.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 1024,
+        "hdd": 2,
+        "os": "debian",
+        "version": "12"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": []
+}