fix: Add explicit MIME type configuration for static files

- Configure FileExtensionContentTypeProvider for Blazor assets
- Set correct MIME types: .wasm, .js, .mjs, .json, .svg, .woff, .woff2
- Enable ServeUnknownFileTypes for flexibility
- Fixes 'Empty MIME type' error on Blazor module loading
- Resolves ReconnectModal and dotnet.js loading failures

MIME type mapping:
- .wasm → application/wasm
- .js → application/javascript
- .mjs → application/javascript
- .json → application/json
- .svg → image/svg+xml
- .woff → font/woff
- .woff2 → font/woff2

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/dotnet/QuantEngine.Web/Program.cs

@@ -8,6 +8,7 @@ using QuantEngine.Core.Interfaces;
 using QuantEngine.Application.Services;
 using QuantEngine.Application.Interfaces;
 using System.Text.Json;
+using Microsoft.AspNetCore.StaticFiles;
 using static QuantEngine.Application.Services.DataCollectionService;
 using Serilog;
 using QuantEngine.Web.Client.Infrastructure;
@@ -121,6 +122,23 @@ app.UseStatusCodePages(async ctx =>
 
 app.UseHttpsRedirection();
 
+// Configure static file MIME types for Blazor
+var provider = new FileExtensionContentTypeProvider();
+provider.Mappings[".wasm"] = "application/wasm";
+provider.Mappings[".js"] = "application/javascript";
+provider.Mappings[".mjs"] = "application/javascript";
+provider.Mappings[".json"] = "application/json";
+provider.Mappings[".svg"] = "image/svg+xml";
+provider.Mappings[".woff"] = "font/woff";
+provider.Mappings[".woff2"] = "font/woff2";
+
+app.UseStaticFiles(new StaticFileOptions
+{
+    ContentTypeProvider = provider,
+    ServeUnknownFileTypes = true,
+    DefaultContentType = "application/octet-stream"
+});
+
 app.UseAntiforgery();
 app.UseAuthentication();
 app.UseAuthorization();