SparkyFitness (#12185)

* Add sparkyfitness (ct)

* Fix URL and improve backup commands in script

* Fix path formatting in installation script

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Co-authored-by: push-app-to-main[bot] <203845782+push-app-to-main[bot]@users.noreply.github.com>
Co-authored-by: CanbiZ (MickLesk) <47820557+MickLesk@users.noreply.github.com>

frontend/public/json/sparkyfitness.json

@@ -0,0 +1,35 @@
+{
+  "name": "SparkyFitness",
+  "slug": "sparkyfitness",
+  "categories": [
+    9
+  ],
+  "date_created": "2026-02-16",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": 80,
+  "documentation": "https://codewithcj.github.io/SparkyFitness",
+  "website": "https://github.com/CodeWithCJ/SparkyFitness",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/sparkyfitness.webp",
+  "config_path": "/etc/sparkyfitness/.env",
+  "description": "A self-hosted, privacy-first alternative to MyFitnessPal. Track nutrition, exercise, body metrics, and health data while keeping full control of your data.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/sparkyfitness.sh",
+      "resources": {
+        "cpu": 2,
+        "ram": 2048,
+        "hdd": 4,
+        "os": "Debian",
+        "version": "13"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": []
+}