feat: implement background post content extraction - #185

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4, actions/upload-artifact@v4, dorny/test-reporter@v1, marocchino/sticky-pull-request-comment@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'AspireTablesExtensions.AddAzureTableClient(IHostApplicationBuilder, string, Action<AzureDataTablesSettings>?, Action<IAzureClientBuilder<TableServiceClient, TableClientOptions>>?)' is obsolete: 'Use AddAzureTableServiceClient instead. This method will be removed in a future version.'

'AspireBlobStorageExtensions.AddAzureBlobClient(IHostApplicationBuilder, string, Action<AzureStorageBlobsSettings>?, Action<IAzureClientBuilder<BlobServiceClient, BlobClientOptions>>?)' is obsolete: 'Use AddAzureBlobServiceClient instead. This method will be removed in a future version.'

'AspireTablesExtensions.AddAzureTableClient(IHostApplicationBuilder, string, Action<AzureDataTablesSettings>?, Action<IAzureClientBuilder<TableServiceClient, TableClientOptions>>?)' is obsolete: 'Use AddAzureTableServiceClient instead. This method will be removed in a future version.'

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'blobClient' in 'DataStorageService.DataStorageService(TableServiceClient tblClient, BlobServiceClient blobClient)'.

Possible null reference argument for parameter 'tblClient' in 'DataStorageService.DataStorageService(TableServiceClient tblClient, BlobServiceClient blobClient)'.

'AspireTablesExtensions.AddAzureTableClient(IHostApplicationBuilder, string, Action<AzureDataTablesSettings>?, Action<IAzureClientBuilder<TableServiceClient, TableClientOptions>>?)' is obsolete: 'Use AddAzureTableServiceClient instead. This method will be removed in a future version.'

'AspireBlobStorageExtensions.AddAzureBlobClient(IHostApplicationBuilder, string, Action<AzureStorageBlobsSettings>?, Action<IAzureClientBuilder<BlobServiceClient, BlobClientOptions>>?)' is obsolete: 'Use AddAzureBlobServiceClient instead. This method will be removed in a future version.'