feat: add AI-powered visual regression testing infrastructure

- Add docker-compose.web-testing.yml with vlmkit service
- Add 5 test scripts: capture, compare, pipeline, console-monitor, link-checker
- Add vrt.config.json with 3 viewports + maskSelectors
- Add package.json with @mizchi/vlmkit and Node >=24
- Add tests/README.md with VRT documentation
- Update .gitignore for test artifacts

Based on APAW issue #144 / milestone #106

.gitignore

@@ -1,46 +1,9 @@
-# Dependencies
-node_modules/
-
-# Environment
 .env
-.env.*
-!.env.example
-
-# Secrets & sensitive data
-docker-compose.override.yml
-wg/
-dump/
-dump.zip
-*.csv
-
-# Database
-db/
-*.db
-
-# Logs
+node_modules/
+tests/node_modules/
+tests/screenshots/
+tests/visual/baseline/
+tests/visual/current/
+tests/visual/diff/
+tests/reports/
 *.log
-
-# OS
-.DS_Store
-
-# Kilo Code — entire directory (agents, skills, rules, workflows, etc.)
-.kilo/
-
-# Kilo Code — project-level config files (not part of telegram-shop source)
-kilo-meta.json
-kilo.jsonc
-AGENTS.md
-
-# Architect generated maps
-.architect/
-
-# Local workspace / worktrees
-.work/
-
-# Tor onion addresses (secret)
-tor-proxy/hosts/onion-hosts.txt
-
-# Python cache
-__pycache__/
-*.pyc
-*.pyo