feat(root): add justfile with cargo script targets

Add a Justfile defining tasks for formatting, linting, testing, building, cleaning, and installing lapctl.

- New Features: introduce default target to list recipes and provide cargo-like commands
- Enhancements: streamline common development workflows
- Bug Fixes: none

justfile

@@ -0,0 +1,39 @@
+# Default target: list all recipes
+default:
+    @just --list
+
+# Format the code automatically
+fmt:
+    cargo fmt
+
+# Check formatting exactly as CI does without changing files
+fmt-check:
+    cargo fmt --all -- --check
+
+# Check if the code compiles without building an executable
+check:
+    cargo check
+
+# Run the linter (clippy) to catch common mistakes
+lint:
+    cargo clippy -- -D warnings
+
+# Run all unit and integration tests (verbose)
+test:
+    cargo test --verbose
+
+# Build the project in debug mode (verbose)
+build:
+    cargo build --verbose
+
+# Build the project in release mode (optimized)
+release:
+    cargo build --release
+
+# Clean the build artifacts
+clean:
+    cargo clean
+
+# Install lapctl to your local cargo bin directory
+install: release
+    cargo install --path .