docs: add v1.1.0 release preparation files

RELEASE PREPARATION:
 RELEASE_v1.1.0.md - Complete release notes
   - Feature highlights
   - Code examples
   - Upgrade guide
   - Links and resources

 PUBLISH_CHECKLIST_v1.1.0.md - Step-by-step publishing guide
   - npm publication steps
   - MCP Registry update steps
   - GitHub Release creation
   - Verification checklist
   - Troubleshooting guide

 PROMOTION_v1.1.0.md - Marketing content
   - Twitter/X posts (2 versions)
   - V2EX post (Chinese)
   - 掘金 article (Chinese)
   - Reddit post (English)
   - Email template
   - Social media timing

READY FOR:
1. npm publish ([email protected])
2. npm publish ([email protected])
3. MCP Registry update
4. GitHub Release v1.1.0
5. Social media promotion

All documents are comprehensive and ready to use!

Author: Libres-coder