Implement Sender ID APIs

[teesofttech]

Summary

Adds typed SDK support for Termii sender ID operations.

What changed

• Added client.SenderIds via ITermiiSenderIdClient.
• Added sender ID listing through GET /api/sender-id.
• Added optional sender ID/status filters.
• Added sender ID request support through POST /api/sender-id/request.
• Added typed request and response models.
• Added unit tests for request paths, request bodies, response parsing, and validation.
• Updated integration smoke coverage to verify the sender ID client is exposed.
• Updated README and API coverage entries.

Validation

• dotnet restore Termii.SDK.sln
• dotnet build Termii.SDK.sln --configuration Release --no-restore
• dotnet test tests/Termii.Tests/Termii.Tests.csproj --configuration Release --no-build --logger "trx;LogFileName=unit-tests.trx"
• dotnet test tests/Termii.IntegrationTests/Termii.IntegrationTests.csproj --configuration Release --no-build --logger "trx;LogFileName=integration-tests.trx"
• dotnet pack src/Termii/Termii.csproj --configuration Release --no-build --output artifacts/packages

Closes #3

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 834b5eeb-1cb1-4e06-b64b-57ebcd1a34f1

📥 Commits

Reviewing files that changed from the base of the PR and between c8c732c and 93ae6c7.

📒 Files selected for processing (12)

• README.md
• docs/API_COVERAGE.md
• src/Termii/SenderIds/GetSenderIdsRequest.cs
• src/Termii/SenderIds/ITermiiSenderIdClient.cs
• src/Termii/SenderIds/RequestSenderIdRequest.cs
• src/Termii/SenderIds/RequestSenderIdResponse.cs
• src/Termii/SenderIds/SenderIdListResponse.cs
• src/Termii/SenderIds/SenderIdRecord.cs
• src/Termii/SenderIds/TermiiSenderIdClient.cs
• src/Termii/TermiiClient.cs
• tests/Termii.IntegrationTests/TermiiClientIntegrationTests.cs
• tests/Termii.Tests/TermiiSenderIdClientTests.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/3-sender-id-apis

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