Update package name to @mxjxn/lssvm-abis for npm publishing

Changed from @lssvm/abis to @mxjxn/lssvm-abis to use personal npm scope
since @lssvm organization doesn't exist on npm.

Author: mxjxn

packages/lssvm-abis/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@lssvm/abis",
+  "name": "@mxjxn/lssvm-abis",
   "version": "0.1.0",
   "description": "Shared ABIs, addresses, and types for LSSVM (Liquidity-Sensitive Single-Variant Market) contracts",
   "license": "AGPL-3.0",