✨♻️ bevy_vanth, vanth, vanth_derive, flake: Add Bevy integration crate and refactor entity/networking

- Created new crate `bevy_vanth` with basic plugin structure for Bevy integration.
- Refactored `Id` generation in `vanth` to use `OsRng` and removed redundant `to_u128_pair`/`from_u128_pair` methods.
- Moved networking functionality into new `net` module with `Node`, `Packet`, and `Message` types.
- Updated `vanth_derive` to use `proc-macro-crate` for reliable crate path resolution.
- Added `rand` dependency to replace custom ID generation logic.
- Updated `Cargo.toml`/`Cargo.lock` with new dependencies: `bevy_app`, `nix`, `cfg_aliases`, `proc-macro-crate`.
- Modified `README.md` with improved project description.
- Added commented clippy check in `flake.nix`.

flake.nix

@@ -94,6 +94,18 @@
                             '';
                         }
                     );
+
+                    clippyCheck = craneLib.cargoClippy (
+                        commonArgs
+                        // craneArgs
+                        // {
+                            inherit cargoArtifacts;
+                            pname = "vanth-clippy";
+                            version = "0.1.0";
+                            # Fail on any lint warning and cover all targets/features.
+                            cargoClippyExtraArgs = "--all-targets --all-features -- -D warnings";
+                        }
+                    );
                 in
                 {
                     packages = rec {
@@ -101,6 +113,10 @@
                         default = vanth;
                     };
 
+                    checks = {
+                        # clippy = clippyCheck;
+                    };
+
                     devShells.default = craneLib.devShell {
                         inputsFrom = [ vanth ];
                         packages = packages;