ctx/feat(dataplane): add settable storage domain suffix for azure

[ctxswitch]

• Added a new AZURE_STORAGE_DOMAIN_SUFFIX global to the dataplane Azure values with a default of core.windows.net. Wired it into both the stow domain_suffix config (which controls signed URL generation) and the metadataBucketPrefix (which controls internal ABFS paths), eliminating all hardcoded core.windows.net references.
• Updated the two Azure test values files to mirror the change and regenerated snapshots — all Azure tests pass.
• Users can now set global.AZURE_STORAGE_DOMAIN_SUFFIX to their custom domain to address Private Endpoint DNS issues.

[aviator-app]

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