feat(android): add standalone accessibility XPath audit core

[quanruzhuoxiu]

Summary

• add internal XML parsing, structural XPath, candidate generation, and replay-query primitives used by the audit workflow
• capture the exact Android accessibility XML source with YADB-to-UIAutomator fallback and normalize it into a complete UiNode tree
• add source/fresh/revisit audit modeling, metadata collection, report data generation, and cross-stack fixtures

Scope

This PR is self-contained on main. It does not enable production XPath caching, add a cache feature flag, or depend on another unmerged PR. The internal XPath primitives are introduced only to support the audit tool in this stack.

Stack order:

1. this PR: audit core and Android capture support
2. feat/android-xpath-audit-cli-standalone: capture CLI and static HTML report
3. feat/android-xpath-audit-playground-standalone: live Playground audit UI

Validation

• pnpm --filter @midscene/core exec vitest --config vitest.config.ts --run tests/unit-test/device-cache/parse-xml.test.ts tests/unit-test/device-cache/xpath-cross-state.test.ts tests/unit-test/device-cache/xpath-query.test.ts tests/unit-test/device-cache/xpath-tree.test.ts (77 tests)
• pnpm --filter @midscene/android exec vitest --config vitest.config.ts --run tests/unit-test/audit-metadata.test.ts tests/unit-test/cache-compatibility.test.ts tests/unit-test/page.test.ts tests/unit-test/uiautomator-tree.test.ts tests/unit-test/xpath-audit.test.ts (231 tests)
• pnpm exec nx run-many --target=build --projects=@midscene/core,@midscene/android --skip-nx-cache
• pnpm run lint

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