docs(facebookadsmcp): add Facebook Ads MCP connector documentation

[ravibits]

Adds AgentKit connector documentation for Facebook Ads MCP (Meta's official Ads MCP Server), covering 95 tools across catalog management, campaign/ad management, signals & datasets, A/B tests & Conversion Lift, reporting, activity logs, and help/troubleshooting.

Stub disclosure: _setup-facebookadsmcp.mdx has auth-type-specific setup steps auto-generated for bring-your-own OAuth 2.1 with PKCE (Meta's DCR endpoint rejects DCR registration despite advertising support, so this connector requires a manually registered Meta OAuth app). Still needs: (a) screenshots replacing {/* TODO: add screenshot ... */} markers, and (b) verification of the provider-specific navigation steps replacing {/* TODO: add provider-specific steps ... */} markers (Meta's app dashboard layout changes periodically). _section-after-setup-facebookadsmcp-common-workflows.mdx needs workflow examples added (cloned stub only, left for human review).

Preview link: https://deploy-preview-937--scalekit-starlight.netlify.app/agentkit/connectors/facebookadsmcp/

Test plan

• Open the preview link and verify the page renders.
• Tool list shows 95 tools.
• Replace {/* TODO: add screenshot ... */} markers in _setup-facebookadsmcp.mdx.
• Review the setup steps for connector-specific accuracy (Meta app dashboard navigation).

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