Remove large binary files and build outputs

- Remove .NET DLLs, fonts, media files >1MB
- Add large binary patterns to .gitignore
- Keep source code only

.gitignore

@@ -38,3 +38,26 @@ htmlcov/
 # Temp files
 temp/
 *.tmp
+
+# Large binaries and build outputs
+*.dll
+*.exe
+*.so
+*.dylib
+*.ttf
+*.otf
+*.png
+*.jpg
+*.jpeg
+*.mp3
+*.mp4
+*.avi
+*.mov
+*.mkv
+
+# Build outputs
+bin/
+obj/
+build/
+dotnet/**/bin/
+dotnet/**/obj/