docs: Add Swap documentation to Actions SDK

[its-applekid]

Summary

Updates Actions SDK documentation to include Swap functionality (Uniswap, Aero, Velodrome).

Closes ethereum-optimism/actions#316

Changes

• ✅ Added WalletSwapNamespace to generation script
• ✅ Created Swap Documentation API reference page
• ✅ Updated quickstart guide with swap examples
• ✅ Added swap provider configuration to guides
• ✅ Updated navigation to include Swap Documentation

Pattern

Follows the existing Lend Documentation pattern:

1. Modified scripts/generate-actions-components.ts to include swap namespace
2. Created app-developers/reference/actions/swap-documentation.mdx
3. Updated relevant docs pages with swap configuration and examples

Testing

• Run doc generation script to generate swap snippets
• Build docs locally and verify all pages render correctly
• Verify links and cross-references work

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Note: This PR references the mintlify branch which includes Aero/Velodrome functionality.