refactor: Rename TrueCV to RealCV throughout codebase

- Renamed all directories (TrueCV.* -> RealCV.*)
- Renamed all project files (.csproj)
- Renamed solution file (TrueCV.sln -> RealCV.sln)
- Updated all namespaces in C# and Razor files
- Updated project references
- Updated CSS variable names

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/RealCV.Application/Interfaces/IFileStorageService.cs

@@ -0,0 +1,8 @@
+namespace RealCV.Application.Interfaces;
+
+public interface IFileStorageService
+{
+    Task<string> UploadAsync(Stream fileStream, string fileName);
+    Task<Stream> DownloadAsync(string blobUrl);
+    Task DeleteAsync(string blobUrl);
+}