chore: bump version to 4.27.3

[Soulter]

Summary

• bump the project and package versions to 4.27.3
• add curated bilingual release notes for changes since v4.27.2
• highlight passwordless AstrBot Desktop WebUI access and the SharedPreferences performance/deadlock improvements
• include the new release quote

User impact

AstrBot Desktop users can enter the WebUI directly without logging in. SharedPreferences access now uses asynchronous, non-blocking paths to improve performance in affected flows and reduce the risk of apparent freezes and deadlocks.

Validation

• uv run ruff format --check .
• uv run ruff check .
• git diff --check

Summary by Sourcery

Bump the AstrBot project version to 4.27.3 and add bilingual release notes describing the changes since 4.27.2.

New Features:

• Document passwordless AstrBot Desktop WebUI access and other newly introduced user-facing capabilities in the 4.27.3 changelog.

Bug Fixes:

• Record recent stability and correctness fixes across knowledge base search, session handling, MCP tools, agents, Telegram/QQ integrations, and related flows in the 4.27.3 changelog.

Enhancements:

• Capture performance and UX improvements, including asynchronous SharedPreferences access and visual tweaks, in the 4.27.3 changelog.

CI:

• Note maintenance work on GitHub Actions dependencies, pipeline scheduler typing, and OpenAI HTTP client tests in the 4.27.3 changelog.

Documentation:

• Add curated bilingual (English and Chinese) release notes for 4.27.3, including a new release quote and updated deployment/README documentation.

Chores:

• Update internal version metadata to 4.27.3 in the package and project configuration.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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