Retire MCP packages and keep Skills support

[quanru]

Summary

This PR retires Midscene's MCP server surface and keeps the Skills / platform CLI workflow as the supported agent integration path.

Changes

• Remove MCP packages and platform MCP server entry points for web bridge, Android, iOS, HarmonyOS, desktop computer, and the shared MCP package.
• Rename shared MCP tool infrastructure to agent-tools so Skills and platform CLIs can keep using the reusable tool definitions without exposing MCP servers.
• Update package exports, package dependencies, lockfile entries, commit scopes, and source imports to remove MCP package wiring.
• Update English and Chinese docs to position Skills as the recommended agent integration path and turn the MCP page into a retirement / migration note.
• Keep MIDSCENE_MCP_CHROME_PATH as a deprecated alias for MIDSCENE_CHROME_PATH so existing Puppeteer-mode Skills setups do not break during migration.
• Deduplicate report template injection logic through a shared helper to prevent stale nested report templates from being embedded repeatedly.

Why

Midscene no longer needs to ship MCP servers now that Skills cover the agent-driven workflow. Keeping both surfaces increases package, build, docs, and test maintenance cost. This change removes the MCP runtime surface while preserving the lower-level tool definitions required by Skills and platform CLIs.

Validation

• pnpm --dir packages/shared exec vitest --run tests/unit-test/chrome-path.test.ts tests/unit-test/env/global-config-manager.test.ts
• pnpm --dir apps/report exec vitest --run tests/report-template-utils.test.ts
• pnpm exec nx build @midscene/shared --skip-nx-cache --verbose
• pnpm --dir apps/report run build
• pnpm exec nx build @midscene/core --skip-nx-cache --verbose
• pnpm run type-check:tests
• pnpm run lint
• git diff --check

Notes for Reviewers

• The intentional public surface after this PR is Skills / platform CLIs, not MCP servers.
• The old MIDSCENE_MCP_CHROME_PATH variable is intentionally kept only as a migration alias.
• Generated output under dist/ is not committed.

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