Add JSON definition subscriptions

src/content/definitions/default.json

@@ -0,0 +1,21 @@
+{
+  "schemaVersion": 1,
+  "collectionId": "vibeguard-default",
+  "name": "VibeGuard default definitions",
+  "description": "Definitions maintained by the VibeGuard project.",
+  "definitions": [
+    {
+      "id": "mastodon",
+      "name": "Mastodon (official web interface)",
+      "urlPatterns": ["<all_urls>"],
+      "requiredSelectors": [".status__content", ".status, .detailed-status"],
+      "post": {
+        "rootSelectors": [".status", ".detailed-status"],
+        "textSelectors": [".status__content", ".e-content"],
+        "excludedSelectors": [".status__content__spoiler-link", ".status__content__read-more-button"],
+        "idAttributes": ["data-id"],
+        "permalinkSelectors": ["a.status__relative-time[href]", "a.detailed-status__datetime[href]", "a.u-url.u-uid[href]"]
+      }
+    }
+  ]
+}