test merge

* Feat: Add Nix support

Adding Nix support. Nixos modules may follow...

Run directly with `nix run github:RightNow-AI/openfang`

There are a bunch of flake outputs (based on cargo workspace)
Focus on these:
* openfang-cli (default)
* openfang-desktop

* nix: cmake depdencency was introduced via llama

* Follow upstream style

flake.nix

@@ -0,0 +1,55 @@
+{
+  description = "The OpenFang Agent OS";
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-flake.url = "github:juspay/rust-flake";
+  };
+  outputs = inputs @ {flake-parts, ...}:
+    flake-parts.lib.mkFlake {inherit inputs;} {
+      imports = [
+        inputs.rust-flake.flakeModules.default
+        inputs.rust-flake.flakeModules.nixpkgs
+      ];
+      systems = ["x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin"];
+      perSystem = {
+        config,
+        self',
+        inputs',
+        pkgs,
+        system,
+        lib,
+        ...
+      }: {
+        rust-project.src = lib.sources.cleanSource ./.;
+        rust-project.defaults.perCrate.crane.args.buildInputs = with pkgs; [
+          clang
+          openssl
+          pkg-config
+        ];
+        rust-project.crates.openfang-desktop.crane.args.buildInputs = with pkgs; [
+          atk
+          glib
+          gtk3
+          openssl
+          pkg-config
+          webkitgtk_4_1
+        ];
+
+        packages.default = self'.packages.openfang-cli;
+        apps = {
+          openfang-cli = {
+            program = "${self'.packages.openfang-cli}/bin/openfang";
+            meta.description = "CLI tool for the OpenFang Agent OS";
+          };
+          openfang-desktop = {
+            program = "${self'.packages.openfang-desktop}/bin/openfang-desktop";
+            meta.description = "Native desktop application for the OpenFang Agent OS (Tauri 2.0)";
+          };
+          default = self'.apps.openfang-cli;
+        };
+      };
+      flake = {
+      };
+    };
+}