Implement Insights API support

[teesofttech]

Summary

• Add TermiiClient.Insights for balance, DND search, number intelligence/status, and message history endpoints
• Add strongly named request models and flexible response models with extension data for varying Termii response fields
• Add unit coverage for query-string auth/filters and integration smoke coverage
• Update README and API coverage after Token API merge

Docs referenced

• https://developer.termii.com/balance
• https://developer.termii.com/search
• https://developer.termii.com/status
• https://developer.termii.com/history

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 -p:UseSharedCompilation=false -p:BuildInParallel=false -p:MSBuildNodeReuse=false

Closes #9

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 802f2c99-d0ed-4d90-bd3d-a7424d83dc6d

📥 Commits

Reviewing files that changed from the base of the PR and between ffea699 and 5126ad3.

📒 Files selected for processing (16)

• README.md
• docs/API_COVERAGE.md
• src/Termii/Insights/CheckDndRequest.cs
• src/Termii/Insights/CheckDndResponse.cs
• src/Termii/Insights/GetBalanceResponse.cs
• src/Termii/Insights/GetMessageHistoryRequest.cs
• src/Termii/Insights/ITermiiInsightsClient.cs
• src/Termii/Insights/MessageHistoryRecord.cs
• src/Termii/Insights/MessageHistoryResponse.cs
• src/Termii/Insights/QueryNumberRequest.cs
• src/Termii/Insights/QueryNumberResponse.cs
• src/Termii/Insights/TermiiInsightsClient.cs
• src/Termii/Insights/TermiiInsightsQueryString.cs
• src/Termii/TermiiClient.cs
• tests/Termii.IntegrationTests/TermiiClientIntegrationTests.cs
• tests/Termii.Tests/TermiiInsightsClientTests.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/9-insights-api

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