chore: sync npm lockfile peer flags and frontend build cache.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/package-lock.json

@@ -248,6 +248,7 @@
       "integrity": "sha512-CGOfOJqWjg2qW/Mb6zNsDm+u5vFQ8DxXfbM09z69p5Z6+mE1ikP2jUXw+j42Pf1XTYED2Rni5f95npYeuwMDQA==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.29.0",
         "@babel/generator": "^7.29.0",
@@ -11102,6 +11103,7 @@
       "integrity": "sha512-EksG6gFY3L1eFMROS/7Wzgrii5mBAFe4rIr3r2BTfo7bcc+DWwFZ4OJ/miOuHJO/A85HwyI4eQ0F6IKXesO7Fg==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@types/eslint-scope": "^3.7.7",
         "@types/estree": "^1.0.6",