Add 5 OpenClaw utility MCP servers

[yedanyagamiai-cmd]

Summary

• Add 5 community MCP servers to the README under the Community Servers section:
  • Color Palette MCP - Generate, analyze, and convert color palettes (HEX, RGB, HSL) with color harmony rules
  • JSON Toolkit MCP - Validate, format, diff, query (JSONPath), and transform JSON data
  • Prompt Enhancer MCP - Optimize LLM prompts with rewriting, scoring, and structural analysis
  • Regex Engine MCP - Test, debug, and explain regular expressions with match highlighting and pattern generation
  • Timestamp Converter MCP - Convert between Unix timestamps, ISO 8601, and human-readable formats across timezones

Details

• All 5 servers are hosted on Cloudflare Workers with Streamable HTTP transport via /mcp endpoints
• Each entry is placed in correct alphabetical order within the Community Servers section
• Entries follow the existing format used by other community server entries

Test plan

• Verify each server URL returns valid MCP responses
• Confirm alphabetical ordering is correct
• Check formatting matches existing entries