CL-7155 | fix dependency placement for rollup plugin and type packages

@rollup/plugin-typescript sat in dependencies but nothing imports it —
src/util/cloud-function/cloud-functions.ts only uses rollup,
@rollup/plugin-node-resolve, @rollup/plugin-commonjs and
@rollup/plugin-json (verified by grepping every rollup import in src).
It also declares a non-optional peer on typescript, which is a
devDependency here only, so an end user installing this plugin would
hit an unmet peer or drag a second typescript tree into a production
install. Removed it.

@types/express and @types/express-serve-static-core are type-only
packages that belong in devDependencies, not dependencies. Moved them.

Regenerated package-lock.json against the Contentstack npm registry and
verified a from-clean rm -rf dist && npm run build still passes.

#claude_code#
🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: naeem-shakh-cs

package-lock.json

@@ -27,9 +27,6 @@
     "@rollup/plugin-commonjs": "^28.0.9",
     "@rollup/plugin-json": "^6.1.0",
     "@rollup/plugin-node-resolve": "^16.0.3",
-    "@rollup/plugin-typescript": "^12.3.0",
-    "@types/express": "^4.17.25",
-    "@types/express-serve-static-core": "^4.19.9",
     "adm-zip": "^0.6.1",
     "chalk": "^4.1.2",
     "dotenv": "^16.4.7",
@@ -40,6 +37,8 @@
     "rollup": "^4.63.4"
   },
   "devDependencies": {
+    "@types/express": "^4.17.25",
+    "@types/express-serve-static-core": "^4.19.9",
     "@types/jest": "^29.5.14",
     "@types/lodash": "^4.17.13",
     "@types/node": "^22.0.0",