refactor: rename MERGE_CHECKLIST to ALL_TESTS + add per-service test files
- tests/MERGE_CHECKLIST.md → tests/ALL_TESTS.md (git rename, updated header + index of sub-files)
- tests/backend_tests.md — §1–9, §18 (auth, users, admin, groups, appearance, service health, plugins, AI/doc settings, infra/security)
- tests/frontend_tests.md — §19 (UI & routing)
- tests/doc-service_tests.md — §10–16 (upload/processing, list/filtering, slide-over, sharing, categories, bulk actions, watch directory)
- tests/ai-service_tests.md — §17 (AI queue & providers)
- CLAUDE.md: updated merge checklist section, file tree, and self-update checkpoint with mandatory test-file update rule
- settings.local.json: added docker inspect/ps, curl, lsof, git merge/branch/log/diff/status/config/mv permissions
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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