feat installer and download model on first launch

pyproject.toml

@@ -5,6 +5,7 @@ description = ""
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
+    "certifi>=2025.1.31",
     "ddgs>=9.16.0",
     "llama-cpp-python>=0.3.35",
     "nvidia-ml-py>=13.610.43",
@@ -14,6 +15,8 @@ dependencies = [
 
 [dependency-groups]
 dev = [
+    "pyinstaller>=6.11",
+    "pyinstaller-hooks-contrib>=2025.8",
     "pytest>=8.3",
     "ruff>=0.8",
 ]