build: migrate from Make to Zig build system + Just

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I7585121a5ec8e797adc43ba8e30d4ac86a6a6964

Justfile

@@ -0,0 +1,20 @@
+# Build the project
+build:
+  zig build
+
+# Build and run
+dev:
+  zig build run
+
+# Clean build artifacts
+clean:
+  rm -rf zig-out .zig-cache
+
+# Format all C source files
+fmt:
+  clang-format -i src/*.c src/*.h
+  zig fmt **/*.zig
+
+# Check formatting
+fmt-check:
+  clang-format --dry-run --Werror src/*.c src/*.h