chore(security): move @lingui/vite-plugin to devDependencies in twenty-server

The plugin is only referenced by package.json -- no source file
imports it. It was misclassified as a runtime dep, which pulled
@lingui/cli into the production node_modules tree via "yarn workspaces
focus --production". @lingui/cli bundles esbuild 0.21.5 (vulnerable
Go binary), and that copy was shipping into the Docker image nested
at node_modules/@lingui/cli/node_modules/esbuild/.

Verified by running "yarn workspaces focus --production twenty
twenty-server twenty-emails twenty-shared twenty-client-sdk" and
inspecting the resulting node_modules: only esbuild 0.27.7 (from
twenty-client-sdk) remains.

packages/twenty-server/package.json

@@ -50,7 +50,6 @@
     "@lingui/core": "^5.1.2",
     "@lingui/format-po": "5.1.2",
     "@lingui/react": "5.1.2",
-    "@lingui/vite-plugin": "5.1.2",
     "@microsoft/microsoft-graph-client": "3.0.7",
     "@microsoft/microsoft-graph-types": "^2.40.0",
     "@nestjs/axios": "3.1.2",
@@ -195,6 +194,7 @@
   "devDependencies": {
     "@faker-js/faker": "^9.8.0",
     "@lingui/cli": "^5.1.2",
+    "@lingui/vite-plugin": "5.1.2",
     "@nestjs/cli": "^11.0.16",
     "@nestjs/devtools-integration": "^0.2.1",
     "@nestjs/schematics": "^11.0.9",