feat(block): Add cloudwatch publish operation

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Summary

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Fixes #(issue)

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• Bug fix
• New feature
• Breaking change
• Documentation
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• Self-reviewed my changes
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PR Summary

Medium Risk
Adds a new authenticated API route that accepts AWS credentials and publishes CloudWatch metrics, increasing the blast radius if validation/auth or logging is misconfigured. Otherwise changes are additive and isolated to the CloudWatch tool/block wiring.

Overview
Adds support for publishing custom CloudWatch metrics via a new cloudwatch_put_metric_data tool and corresponding CloudWatch block operation.

Introduces a new Next.js API route (/api/tools/cloudwatch/put-metric-data) that validates inputs (including allowed units), converts optional dimensions JSON into CloudWatch Dimensions, sends PutMetricDataCommand, and returns the published metric metadata (including timestamp).

Wires the new operation through the block UI (new fields for value/unit/dimensions, updated param mapping/validation) and registers the tool in tools/cloudwatch/index.ts, tools/registry.ts, and tools/cloudwatch/types.ts.

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