feat(AzureSpeech): update Speech SDK to 1.51.0

[ArgoZhang]

Link issues

fixes #1123

Summary By Copilot

• update the bundled Microsoft Cognitive Services Speech SDK from the existing browser artifact to 1.51.0
• keep the official minified and development bundles synchronized and load the minified bundle at runtime
• replace the private recognition result field privText with the public text API
• bump BootstrapBlazor.AzureSpeech to version 10.0.2

Regression?

• Yes
• No

The Speech SDK APIs used by AzureSpeech retain compatible signatures in 1.51.0.

Risk

• High
• Medium
• Low

The public .NET and JavaScript interop signatures are unchanged. The recognition result now uses the SDK's documented public property.

Verification

• Manual (required)

• Automated

• built BootstrapBlazor.AzureSpeech for all target frameworks with no warnings or errors

• checked the updated runtime and SDK bundles with Node.js syntax validation

• confirmed both vendored bundles match the official npm package artifacts

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

[sourcery-ai]

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