chore: update baton-sdk to v0.7.16

[gontzess]

Summary

• Upgrade baton-sdk to v0.7.16
• Upgrade Go to 1.25.x
• Add WithDefaultCapabilitiesConnectorBuilder for capabilities workflow
• Update config.go for new SDK API (field.WithConstraints)
• Update CredentialOptions to LocalCredentialOptions
• Delete main.yaml (replaced by verify.yaml from baton-admin)

Build Status

• go build ./... passes locally

Test plan

• Build passes
• Verify CI passes

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch task-sdk-upgrade-batch-7

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[ggreer]

We should have merged this but #51 is the newer version of the same update.