Fix CI: Add missing webpack-subresource-integrity dependency

- Added webpack-subresource-integrity@^5.2.0-rc.1 to package.json
- Resolves frontend build error: 'Cannot find module webpack-subresource-integrity'
- Required by scripts/webpack/webpack.prod.js for SubresourceIntegrityPlugin
- Missing dependency from CI migration - present in blueprint but lost during migration
- Updated yarn.lock with new dependency resolution

Issue #9 resolved: Frontend webpack build failure fixed.

package.json

@@ -244,6 +244,7 @@
     "webpack-livereload-plugin": "3.0.2",
     "webpack-manifest-plugin": "5.0.0",
     "webpack-merge": "6.0.1",
+    "webpack-subresource-integrity": "^5.2.0-rc.1",
     "webpackbar": "^7.0.0",
     "yaml": "^2.0.0",
     "yargs": "^17.5.1"

yarn.lock

@@ -17941,6 +17941,7 @@ __metadata:
     webpack-livereload-plugin: "npm:3.0.2"
     webpack-manifest-plugin: "npm:5.0.0"
     webpack-merge: "npm:6.0.1"
+    webpack-subresource-integrity: "npm:^5.2.0-rc.1"
     webpackbar: "npm:^7.0.0"
     whatwg-fetch: "npm:3.6.20"
     xlsx: "https://cdn.sheetjs.com/xlsx-0.20.2/xlsx-0.20.2.tgz"
@@ -30907,6 +30908,19 @@ __metadata:
   languageName: node
   linkType: hard
 
+"webpack-subresource-integrity@npm:^5.2.0-rc.1":
+  version: 5.2.0-rc.1
+  resolution: "webpack-subresource-integrity@npm:5.2.0-rc.1"
+  peerDependencies:
+    html-webpack-plugin: ">= 5.0.0-beta.1 < 6"
+    webpack: ^5.12.0
+  peerDependenciesMeta:
+    html-webpack-plugin:
+      optional: true
+  checksum: 10/a63e4e999812a753c70070457e6a2fb7e7ef1a05d8525a89796024fc56f26a0e56bd3e8f2b25e61f0ae969d627770a1fe326bebb58c296577d40c6a12aa4be37
+  languageName: node
+  linkType: hard
+
 "webpack-virtual-modules@npm:^0.5.0":
   version: 0.5.0
   resolution: "webpack-virtual-modules@npm:0.5.0"