docs(motherduckmcp): add MotherDuck MCP connector documentation

[Pranesh-Raghu]

Summary

Adds documentation for the MotherDuck MCP connector — an OAuth 2.1 (MCP) connector for querying and analyzing DuckDB databases, with 28 tools covering database queries, Dives (interactive React data apps), and Flights (scheduled Python compute jobs).

Files added

• src/content/docs/agentkit/connectors/motherduckmcp.mdx — connector quickstart page
• src/data/agent-connectors/motherduckmcp.ts — tool data (28 tools)
• src/data/agent-connectors/catalog.ts — catalog entry added
• src/components/templates/agent-connectors/_setup-motherduckmcp.mdx — setup stub (cloned from atlassianmcp)
• src/components/templates/agent-connectors/_section-after-setup-motherduckmcp-common-workflows.mdx — common workflows stub (cloned from atlassianmcp)
• src/components/templates/agent-connectors/index.ts — exports for SetupMotherduckmcpSection and SectionAfterSetupMotherduckmcpCommonWorkflows

Stub disclosure

_setup-motherduckmcp.mdx and _section-after-setup-motherduckmcp-common-workflows.mdx are cloned stubs from atlassianmcp and require:

• (a) Real screenshots replacing {/* TODO: add screenshot ... */} markers
• (b) Review and update of connector-specific setup steps (OAuth scopes, app registration flow, MotherDuck-specific URLs)
• (c) The common workflows section currently references Atlassian-specific concepts (cloudId, Atlassian resources) and must be rewritten for MotherDuck

Preview link

https://deploy-preview-781--scalekit-starlight.netlify.app/agentkit/connectors/motherduckmcp/

Test plan

• Open the preview link and verify the page renders
• Tool list shows 28 tools
• Replace {/* TODO: add screenshot ... */} markers in _setup-motherduckmcp.mdx
• Rewrite _section-after-setup-motherduckmcp-common-workflows.mdx with MotherDuck-specific workflows (query, dive creation, flight scheduling)
• Review the setup steps for connector-specific accuracy (OAuth scopes, redirect URI, MotherDuck app registration)

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✨ Finishing Touches

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• 🛠️ fix frontmatter
• 🛠️ fix internal links

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