Add new artfight attack

data/art/2025/swampmagic.json

@@ -0,0 +1,11 @@
+{
+    "alt_text": "Drawing of Roseanna in a very green getup, complete with green hat and even green metal pauldrons. She is waving her magical wooden staff around at a yet-unknown enemy. In the background is a deep swamp, and she is standing on a lily pad.",
+    "date": "2025-07-06",
+    "title": "Swamp magic!",
+    "tags": ["Artfight", "fan art"],
+    "characters": ["Roseanna"],
+    "program": "Krita",
+    "description": "Artfight attack: https://artfight.net/attack/10090458.swamp-magic",
+    "mastodon_url": "https://mastodon.art/@redstrate/114808227956122713",
+    "bluesky_url": "https://bsky.app/profile/redstrate.com/post/3ltd53imqac2u"
+}