[draft] add direnv, nix configs, and uv lock file

.envrc

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+layout python
+# use nix

shell.nix

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+{ pkgs ? import <nixpkgs> { config = { allowUnfree = true; }; } }:
+
+(pkgs.buildFHSEnv {
+  name = "dottxt-ai";
+  targetPkgs = pkgs: with pkgs; [
+    autoconf
+    binutils
+    cmake
+    cudatoolkit
+    curl
+    freeglut
+    gcc13
+    git
+    gitRepo
+    gnumake
+    gnupg
+    gperf
+    libGL
+    libGLU
+    linuxPackages.nvidia_x11
+    m4
+    ncurses5
+    procps
+    python3Packages.numpy
+    python3Packages.pytorch
+    python3Packages.pytorch
+    python3Packages.torch
+    python3Packages.xformers
+    stdenv.cc
+    unzip
+    util-linux
+    uv
+    xorg.libX11
+    xorg.libXext
+    xorg.libXi
+    xorg.libXmu
+    xorg.libXrandr
+    xorg.libXv
+    zlib
+  ];
+
+  multiPkgs = pkgs: with pkgs; [ zlib ];
+
+  runScript = "bash";
+
+  profile = ''
+    # CUDA paths
+    export CUDA_HOME=${pkgs.cudatoolkit}
+    export CUDA_PATH=${pkgs.cudatoolkit}
+
+    # Ensure proper binary paths are included
+    export PATH=${pkgs.gcc13}/bin:${pkgs.cudatoolkit}/bin:$PATH
+
+    # Set library paths, including additional directories for CUPTI
+    export LD_LIBRARY_PATH=${pkgs.cudatoolkit}/lib64:${pkgs.cudatoolkit}/extras/CUPTI/lib64:${pkgs.linuxPackages.nvidia_x11}/lib:$LD_LIBRARY_PATH
+
+    # Add static library paths to EXTRA_LDFLAGS for the linker
+    export EXTRA_LDFLAGS="-L${pkgs.cudatoolkit}/lib64 -L${pkgs.cudatoolkit}/extras/CUPTI/lib64 -L${pkgs.linuxPackages.nvidia_x11}/lib -L${pkgs.cudatoolkit}/libdevice $EXTRA_LDFLAGS"
+    export EXTRA_CCFLAGS="-I${pkgs.cudatoolkit}/include $EXTRA_CCFLAGS"
+
+    # Set CMake paths
+    export CMAKE_PREFIX_PATH=${pkgs.cudatoolkit}:${pkgs.linuxPackages.nvidia_x11}:$CMAKE_PREFIX_PATH
+
+    # C++ and CC flags
+    export CXXFLAGS="--std=c++17 $EXTRA_CCFLAGS"
+    export CC=${pkgs.gcc13}/bin/gcc
+    export CXX=${pkgs.gcc13}/bin/g++
+
+    # NVCC flags to use the right compiler
+    export NVCC_FLAGS="-ccbin ${pkgs.gcc13}/bin/gcc"
+  '';
+
+  structuredAttrs__ = {
+    stdenv = pkgs.stdenv.overrideCC pkgs.stdenv.cc pkgs.gcc13;
+  };
+}).env