fix: CI/CD blue-green deployment path bug causing stale production content

Root cause: switch-traffic.sh was modifying Traefik config in the CI checkout
directory ($GITHUB_WORKSPACE) instead of the deployment directory ($DEPLOY_PATH).
Traefik never saw the weight changes, so traffic stayed on old containers.

Changes:
- Add DEPLOY_PATH environment variable support to all CI scripts
- Add --force-recreate flag to ensure containers are recreated with new images
- Add image verification step to confirm containers use expected images
- Add weight verification to confirm Traefik routing was updated
- Add routing validation step to verify traffic switch succeeded

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/ci/health-check.sh

@@ -12,8 +12,10 @@
 
 set -euo pipefail
 
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+# Use DEPLOY_PATH if set (CI environment), otherwise calculate from script location
+PROJECT_ROOT="${DEPLOY_PATH:-$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)}"
+
+echo "Using PROJECT_ROOT: $PROJECT_ROOT"
 
 STACK="${1:-}"
 TIMEOUT="${2:-60}"