fix: remove devDependencies to fix npm git dep install on Plesk

npm installs devDeps (--include=dev) when preparing git dependencies.
esbuild (via tsx) has native install script that fails on Plesk nodenv.
Since this package exports TypeScript source files directly, no build
tools are needed at install time.

devDependencies (typescript, tsx, @types/react) are only needed for
local development on sv-payload and can be installed manually.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -46,11 +46,7 @@
   ],
   "license": "UNLICENSED",
   "private": true,
-  "devDependencies": {
-    "@types/react": "^19.0.0",
-    "typescript": "^5.7.0",
-    "tsx": "^4.19.0"
-  },
+  "optionalDependencies": {},
   "peerDependencies": {
     "react": "^19.0.0"
   },