Merge branch 'main' into chunk-data

Resolved 29 conflicting files. The notable decisions:

Confidence: main's tool-calling gate (RequiredProviderConfidence) and this
branch's local-RAG gate (DataConfidenceLevel) turned out to be the same rule
on the same axis, so they are now one field. Both tool results and data
sources raise it through RequireProviderConfidence(). The gate checks the
level strictly and no longer exempts providers trusted by configuration:
TrustedProviderIds is documented as applying to data-source security checks
only, and organizations set confidence through DataConfidence
.CustomConfidenceScheme instead. The security axis (DataSecurity, ERI,
IsTrustedForDataSourceSecurityChecks) is unchanged.

Provider creation: main's CreateProvider signature won (hfEndpointKind,
capabilityOverrides, no model parameter); tokenizerPath was added to it and
is set for every provider, including the new Hetzner, IONOS and LiteLLM.
Provider and EmbeddingProvider combine the record parameters, Lua parsing and
Lua serialization of both sides.

File types: main's hierarchy (ODT leaf, WORD parent, PowerPoint without the
legacy .ppt, TABULAR instead of DELIMITED_TABLE) plus this branch's
SPREADSHEET parent with ODS and the xlsm/xlsb/xla/xlam extensions, which the
runtime already reads. Both sides had added a conflicting HTML filter; the
reading family keeps the name, and the export path uses a narrow
HTML_DOCUMENT, following the existing LATEX/TEX split.

Runtime: main's file_data.rs is the base, including the prompt-injection
sanitizer and the extraction routes. Token counting and chunk segmentation
moved into take_released, so they act on the text the filter has released
rather than on text it is still holding. A failed count is logged and left
out instead of ending the extraction, because the app counts such a segment
itself.

Data sources: the participating-provider checks of this branch are kept, and
main's GetAllowedDataSources overload now builds on them. DirectChatService
resolves the launched chat's data source options before the check, so filter
and chat see the same options.

.NET and Rust both build clean; I18N regenerated to 4060 keys.

app/MindWork AI Studio/Components/Settings/SettingsPanelEmbeddings.razor.cs

@@ -16,6 +16,17 @@ public partial class SettingsPanelEmbeddings : SettingsPanelProviderBase
     [Inject]
     private DataSourceEmbeddingService DataSourceEmbeddingService { get; init; } = null!;
 
+    /// <summary>
+    /// Groups the table by the used LLM provider. The embedding provider list is already sorted by
+    /// that provider, so all instances of one LLM provider form a single, coherent group.
+    /// </summary>
+    private static readonly TableGroupDefinition<EmbeddingProvider> GROUP_CONFIG = new()
+    {
+        Expandable = true,
+        IsInitiallyExpanded = false,
+        Selector = provider => provider.UsedLLMProvider,
+    };
+
     [Parameter]
     public List<ConfigurationSelectData<string>> AvailableEmbeddingProviders { get; set; } = new();
     
@@ -68,12 +79,16 @@ public partial class SettingsPanelEmbeddings : SettingsPanelProviderBase
     
     private async Task EditEmbeddingProvider(EmbeddingProvider embeddingProvider)
     {
+        if (embeddingProvider.IsEnterpriseConfiguration && !embeddingProvider.AllowUserProvidedAPIKey)
+            return;
+
         var dialogParameters = new DialogParameters<EmbeddingProviderDialog>
         {
             { x => x.DataNum, embeddingProvider.Num },
             { x => x.DataId, embeddingProvider.Id },
             { x => x.DataName, embeddingProvider.Name },
             { x => x.DataLLMProvider, embeddingProvider.UsedLLMProvider },
+            { x => x.DataCustomIconDataUrl, embeddingProvider.CustomIconDataUrl },
             { x => x.DataModel, embeddingProvider.Model },
             { x => x.DataHostname, embeddingProvider.Hostname },
             { x => x.IsSelfHosted, embeddingProvider.IsSelfHosted },
@@ -82,6 +97,8 @@ public partial class SettingsPanelEmbeddings : SettingsPanelProviderBase
             { x => x.DataTokenizerPath, embeddingProvider.TokenizerPath },
             { x => x.DataTokenLimit, embeddingProvider.EffectiveTokenLimit },
             { x => x.DataEmbeddingBatchSize, embeddingProvider.EffectiveEmbeddingBatchSize },
+            { x => x.HFInferenceProviderId, embeddingProvider.HFInferenceProvider },
+            { x => x.IsEnterpriseConfiguration, embeddingProvider.IsEnterpriseConfiguration },
         };
 
         var dialogReference = await this.DialogService.ShowAsync<EmbeddingProviderDialog>(T("Edit Embedding Provider"), dialogParameters, DialogOptions.FULLSCREEN);
@@ -89,6 +106,16 @@ public partial class SettingsPanelEmbeddings : SettingsPanelProviderBase
         if (dialogResult is null || dialogResult.Canceled)
             return;
 
+        if (embeddingProvider.IsEnterpriseConfiguration)
+        {
+            // Only the API key changed, and the dialog already stored it directly. The provider
+            // object itself is managed by the configuration plugin and must not be overwritten
+            // with the dialog's copy -- doing so would let the locked-but-technically-editable
+            // fields drift from what the organization configured.
+            await this.MessageBus.SendMessage<bool>(this, Event.CONFIGURATION_CHANGED);
+            return;
+        }
+
         var editedEmbeddingProvider = (EmbeddingProvider)dialogResult.Data!;
         
         // Set the provider number if it's not set. This is important for providers
@@ -170,7 +197,7 @@ public partial class SettingsPanelEmbeddings : SettingsPanelProviderBase
     private async Task UpdateEmbeddingProviders()
     {
         this.AvailableEmbeddingProviders.Clear();
-        foreach (var provider in this.SettingsManager.ConfigurationData.EmbeddingProviders)
+        foreach (var provider in this.SettingsManager.GetAllEmbeddingProviders())
             this.AvailableEmbeddingProviders.Add(new (provider.Name, provider.Id));
         
         await this.AvailableEmbeddingProvidersChanged.InvokeAsync(this.AvailableEmbeddingProviders);