Refresh AWS & Azure icon sets from the official 2026 vendor packages

assets/icons/README.md

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+## Third-party icon assets
+
+The icons in assets/icons/ are NOT covered by this project's LICENSE.
+All rights remain with their respective owners.
+
+### Microsoft Azure — assets/icons/azure/
+Source: https://learn.microsoft.com/en-us/azure/architecture/icons/
+        (Azure_Public_Service_Icons_V24)
+
+Microsoft permits the use of these icons in architectural diagrams, training
+materials, or documentation. You can copy, distribute, and display the icons
+only for the permitted use unless granted explicit permission by Microsoft.
+Microsoft reserves all other rights.
+
+Microsoft, Azure, and the Azure icons are trademarks of the Microsoft group
+of companies.
+
+### Amazon Web Services — assets/icons/aws/
+Source: https://aws.amazon.com/architecture/icons/
+        (AWS Architecture Icons, Asset Package 04302026)
+
+AWS permits customers and partners to use these assets to create architecture
+diagrams. Use is subject to the AWS Trademark Guidelines:
+https://aws.amazon.com/trademark-guidelines/
+
+Amazon Web Services, AWS, and the AWS icons are trademarks of Amazon.com, Inc.
+or its affiliates.
+
+Icons are reproduced unmodified apart from proportional rasterisation to 64x64
+PNG. Neither Microsoft nor AWS endorses this project or its output.