Add integration testing infrastructure with Podman Compose

- Add docker/podman-compose.yml for Immich server (no ML)
- Add test-data/sample-photos/ with 3 public domain images
- Add scripts/start-immich.sh for container startup + admin/API key creation
- Add scripts/seed-data.sh for uploading test photos and creating albums
- Add scripts/stop-immich.sh for cleanup with volume destruction
- Add scripts/run-example.sh wrapper (fixed env var export)
- Update examples to use IMMICH_URL and IMMICH_API_KEY env vars
- Add .github/workflows/integration-test.yml for CI
- Update assets.list() to use /search/metadata endpoint
- Update AGENTS.md with example running instructions
- Add 5 new examples: search_metadata, album_management, timeline_browsing,
  delete_assets, server_info

scripts/stop-immich.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -e
+
+cd "$(dirname "$0")/.."
+
+echo "Stopping Immich containers and destroying volumes..."
+podman compose -f docker/podman-compose.yml down -v
+
+# Clean up state files
+rm -f .env.test .seeded
+
+echo "Immich stopped and cleaned up."