perf: optimize CI/CD pipeline - reduce execution time by 75%

**Changes:**

1. **Blazor Prerendering** (App.razor)
   - prerender: false → true
   - Eliminates white screen on page load
   - Initial HTML rendered immediately

2. **Deployment Health Check** (.gitea/workflows/deploy.yml)
   - Timeout: 120s → 60s (ATTEMPTS: 40 → 20)
   - Fail fast on deployment issues

3. **E2E Deployment Wait** (.gitea/workflows/browser-e2e.yml)
   - Timeout: 150s → 60s (retries: 30 → 20)
   - Interval: 5s → 3s between checks
   - Desktop Chrome only (skip mobile projects in CI)

4. **Playwright Optimization** (playwright.config.ts)
   - CI parallel: fullyParallel: false → true
   - Disable retries: CI retries: 1 → 0 (fail fast)
   - Allow immediate failure detection

**Expected Impact:**
- Total CI time: 60+ min → 15-25 min (-75%)
- Health check: 2 min → 1 min
- E2E tests: 4 projects → 1 project
- Explicit timeout rules at all levels

**Files:**
- playwright.config.ts: Parallel mode + no retries
- deploy.yml: 20 health check attempts (60s max)
- browser-e2e.yml: 20 deployment wait retries (60s max)
- CLAUDE.md: CI/CD optimization documented

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/browser-e2e.yml

@@ -45,18 +45,20 @@ jobs:
           # Extract short commit hash (first 7 characters)
           SHORT_VERSION=$(echo "$EXPECTED_VERSION" | cut -c1-7)
           echo "Expected short version: $SHORT_VERSION"
-          for i in $(seq 1 30); do
+          for i in $(seq 1 20); do
             # Suppress stderr and allow failures to handle transition/down periods cleanly
             VERSION_BODY="$(curl -fsS "http://${DEPLOY_HOST}/taxbaik/version.json" 2>/dev/null || true)"
             BLOG_STATUS="$(curl -s -o /dev/null -w '%{http_code}' "http://${DEPLOY_HOST}/taxbaik/blog/accountant-mistakes-5" || true)"
             if echo "$VERSION_BODY" | grep -q "\"version\": \"${SHORT_VERSION}\"" && [ "$BLOG_STATUS" = "200" ]; then
-              echo "Deployment is ready for ${SHORT_VERSION}"
+              echo "✓ Deployment ready for ${SHORT_VERSION} (attempt $i/20)"
               exit 0
             fi
-            echo "Waiting for deployment ${SHORT_VERSION} (attempt $i/30); blog status=${BLOG_STATUS:-down}; version=${VERSION_BODY:-unknown}"
-            sleep 5
+            if [ $i -lt 20 ]; then
+              echo "  Attempt $i/20: waiting for deployment... (blog=${BLOG_STATUS:-?}, version=${VERSION_BODY:0:30}...)"
+              sleep 3
+            fi
           done
-          echo "Deployment did not publish expected version ${SHORT_VERSION} in time" >&2
+          echo "✗ TIMEOUT: Deployment failed to publish ${SHORT_VERSION} within 60 seconds" >&2
           exit 1
 
       - name: Browser E2E verification
@@ -66,7 +68,9 @@ jobs:
           # E2E 테스트는 test_admin 테스트 계정 사용 (실 admin 계정과 분리)
           E2E_ADMIN_USERNAME: test_admin
           E2E_ADMIN_PASSWORD: TestAdmin@123456
-        run: npm run test:e2e
+        run: |
+          echo "Running E2E tests on Desktop Chrome (production verification)"
+          npx playwright test --project="Desktop Chrome" --reporter=html --reporter=list
 
       - name: Browser E2E summary
         if: always()