ci: Pin Node 20, remove yarn cache, add step timeout

Debugging yarn install hang in CI. Changes:
- Pin to Node 20 (lts/* may resolve to Node 22)
- Remove cache: yarn from setup-node (cache may be corrupted)
- Add --network-timeout 300000 to yarn install
- Add timeout-minutes: 10 to install step so it fails fast

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: chargome

.github/workflows/ci-cd.yml

@@ -28,6 +28,7 @@ jobs:
 
       - name: Install Dependencies
         run: yarn install --frozen-lockfile --network-timeout 300000
+        timeout-minutes: 10
 
       - name: Build Project
         run: NODE_OPTIONS='--max-old-space-size=4096' yarn build:all
@@ -64,6 +65,7 @@ jobs:
 
       - name: Install Dependencies
         run: yarn install --frozen-lockfile --network-timeout 300000
+        timeout-minutes: 10
 
       - name: Build Project
         run: NODE_OPTIONS='--max-old-space-size=4096' yarn build:all