fix: suport uv pip install openviking[bot]

[chenjw]

Description

1. pyproject.toml - Added bot optional dependency group with
   "vikingbot>=0.1.2"
2. README.md - Updated VikingBot Quick Start section with two options:
   - Option 1: Install from PyPI with pip install openviking[bot]
   - Option 2: Install from source with uv pip install -e bot/
3. README_CN.md - Updated the Chinese version with the same two options
4. bot/README.md - Added PyPI installation as Option 1 at the top of the
   Install section
5. bot/README_CN.md - Added PyPI installation as Option 1 in the Chinese
   version

Now users can install vikingbot either via pip install openviking[bot] from
PyPI or from local source, and the standard pip behavior allows later source
installs to override PyPI installs.

Related Issue

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

Changes Made

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
  • Linux
  • macOS
  • Windows

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes

[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

[github-actions]

PR Code Suggestions ✨

No code suggestions found for the PR.