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/duplicati.json

@@ -1,40 +1,40 @@
 {
-    "name": "Duplicati",
-    "slug": "duplicati",
-    "categories": [
-        7
-    ],
-    "date_created": "2025-02-06",
-    "type": "ct",
-    "updateable": true,
-    "privileged": false,
-    "interface_port": 8200,
-    "documentation": "https://docs.duplicati.com/",
-    "website": "https://duplicati.com/",
-    "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons/webp/duplicati.webp",
-    "config_path": "",
-    "description": "Duplicati is a free, open-source backup solution that offers zero-trust, fully encrypted backups for your data.",
-    "install_methods": [
-        {
-            "type": "default",
-            "script": "ct/duplicati.sh",
-            "resources": {
-                "cpu": 1,
-                "ram": 1048,
-                "hdd": 10,
-                "os": "debian",
-                "version": "12"
-            }
-        }
-    ],
-    "default_credentials": {
-        "username": null,
-        "password": null
-    },
-    "notes": [
-        {
-            "text": "Admin password and database encryption key: `cat ~/duplicati.creds`",
-            "type": "info"
-        }
-    ]
-}
+  "name": "Duplicati",
+  "slug": "duplicati",
+  "categories": [
+    7
+  ],
+  "date_created": "2025-02-06",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": 8200,
+  "documentation": "https://docs.duplicati.com/",
+  "website": "https://duplicati.com/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons/webp/duplicati.webp",
+  "config_path": "",
+  "description": "Duplicati is a free, open-source backup solution that offers zero-trust, fully encrypted backups for your data.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/duplicati.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 1048,
+        "hdd": 10,
+        "os": "debian",
+        "version": "12"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "Admin password and database encryption key: `cat ~/duplicati.creds`",
+      "type": "info"
+    }
+  ]
+}