chore: update Node.js version to 20 across CI workflows, Amplify build, and package engine requirements.

Author: Bloomingg

.github/workflows/build-ci.yaml

@@ -16,7 +16,7 @@ jobs:
     - name: Setup Node.js
       uses: actions/setup-node@v4
       with:
-        node-version: '18'
+        node-version: '20'
 
     - name: Install pnpm
       uses: pnpm/action-setup@v4

.github/workflows/main-ci.yaml

@@ -16,7 +16,7 @@ jobs:
     - name: Setup Node.js
       uses: actions/setup-node@v4
       with:
-        node-version: '18'
+        node-version: '20'
 
     - name: Install pnpm
       uses: pnpm/action-setup@v4

amplify.yml

@@ -3,7 +3,7 @@ frontend:
   phases:
     preBuild:
       commands:
-        - nvm install 15 && npm ci
+        - nvm install 20 && npm ci
     build:
       commands:
         - npm run build

package.json

@@ -68,7 +68,7 @@
     ]
   },
   "engines": {
-    "node": ">=18.0"
+    "node": ">=20.0"
   },
   "prettier": {
     "singleQuote": true,