fix(devcontainer): add npm install fallback in post-create script (#331)

Add fallback from npm ci to npm install when lockfiles are out of sync.
This fixes devpod setup failures when package-lock.json is not in sync
with package.json (e.g., missing typescript@5.9.3).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Mohsin Hashmi <mhashmi@wiser.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: 3 people

.devcontainer/post-create.sh

@@ -7,12 +7,12 @@ echo "🚀 Setting up SimpleAccounts-UAE development environment..."
 
 # Install root dependencies
 echo "📦 Installing root npm dependencies..."
-npm ci --prefer-offline
+npm ci --prefer-offline || npm install
 
 # Install frontend dependencies
 echo "📦 Installing frontend dependencies..."
 cd apps/frontend
-npm ci --legacy-peer-deps --prefer-offline
+npm ci --legacy-peer-deps --prefer-offline || npm install --legacy-peer-deps
 cd ../..
 
 # Install Playwright browsers (using system Chromium)