docs: add Thought Chain MCP server documentation

[roomote]

This PR attempts to address Issue #9177 by adding documentation for the Thought Chain MCP server.

Changes

• Added comprehensive documentation for the Thought Chain MCP server in docs/marketplace/mcp-servers/thought-chain.md
• Created a README in docs/marketplace/ explaining the marketplace submission process
• Included installation instructions, configuration examples, and feature descriptions

Context

The Thought Chain MCP server (https://github.com/cbuntingde/thought-chain-mcp) provides advanced reasoning capabilities with persistent thought chains, offering more sophisticated features than Sequential Thinking.

Notes

• The marketplace items are managed through a centralized API service
• This documentation serves as a reference for evaluation and provides manual installation guidance
• Users can manually install the server while waiting for official marketplace inclusion

Manual Installation

Users can install the Thought Chain MCP server now by:

1. Running npx thought-chain-mcp or npm install -g thought-chain-mcp
2. Adding the configuration to their .roo/mcp.json file as documented
3. Restarting Roo Code

Closes #9177

Feedback and guidance are welcome!

---

Important

Adds documentation for the Thought Chain MCP server and a marketplace README with installation and feature details.

• Documentation:
  • Adds thought-chain.md in docs/marketplace/mcp-servers/ with installation, configuration, and feature details for the Thought Chain MCP server.
  • Creates README.md in docs/marketplace/ explaining the marketplace submission process.
• Installation:
  • Provides manual installation instructions using npx or npm and configuration in .roo/mcp.json.
• Features:
  • Describes Thought Chain's structured thinking, persistent memory, and problem decomposition capabilities.
  • Lists available tools like start_chain, add_thought, and review_chain.

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[roomote]

Rooviewer   See task on Roo Cloud

Review completed. No issues found.

This PR adds comprehensive documentation for the Thought Chain MCP server. The documentation is well-structured, accurate, and follows the correct configuration format used throughout the codebase. Since these are purely documentation files with no code changes, there's no risk to existing functionality.

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