fix: rename story-kit references to storkit in server code and settings

Updates -p flag in rebuild_and_restart, MCP server name, enabledMcpjsonServers,
and test values to match the new binary/crate name.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/io/fs.rs

@@ -94,7 +94,7 @@ const STORY_KIT_CLAUDE_SETTINGS: &str = r#"{
     ]
   },
   "enabledMcpjsonServers": [
-    "story-kit"
+    "storkit"
   ]
 }
 "#;