Migrate from setuptools to uv_build

Replace setuptools build backend with uv_build (v0.9.28) for all three
workspace members. Configure explicit module names for namespace packages
(nats.client, nats.server) and the main nats package.

Author: fortum-vaanavil

nats-core/pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
-requires = ["setuptools>=61.0"]
-build-backend = "setuptools.build_meta"
+requires = ["uv_build>=0.9.28,<0.10.0"]
+build-backend = "uv_build"
 
 [project]
 name = "nats-core"
@@ -32,8 +32,8 @@ Documentation = "https://github.com/nats-io/nats.py"
 Issues = "https://github.com/nats-io/nats.py/issues"
 Source = "https://github.com/nats-io/nats.py"
 
-[tool.setuptools.packages.find]
-where = ["src"]
+[tool.uv.build-backend]
+module-name = "nats.client"
 
 [dependency-groups]
 dev = [

nats-server/pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
-requires = ["setuptools>=61.0"]
-build-backend = "setuptools.build_meta"
+requires = ["uv_build>=0.9.28,<0.10.0"]
+build-backend = "uv_build"
 
 [project]
 name = "nats-server"
@@ -30,8 +30,8 @@ Documentation = "https://github.com/nats-io/nats.py"
 Issues = "https://github.com/nats-io/nats.py/issues"
 Source = "https://github.com/nats-io/nats.py"
 
-[tool.setuptools.packages.find]
-where = ["src"]
+[tool.uv.build-backend]
+module-name = "nats.server"
 
 [tool.pytest.ini_options]
 asyncio_default_fixture_loop_scope = "function"

nats/pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
-requires = ["setuptools>=68.0"]
-build-backend = "setuptools.build_meta"
+requires = ["uv_build>=0.9.28,<0.10.0"]
+build-backend = "uv_build"
 
 [project]
 name = "nats-py"
@@ -34,12 +34,6 @@ nkeys = ['nkeys']
 aiohttp = ['aiohttp']
 fast_parse = ['fast-mail-parser']
 
-[tool.setuptools]
-zip-safe = true
-package-dir = {"" = "src"}
+[tool.uv.build-backend]
+module-name = "nats"
 
-[tool.setuptools.packages.find]
-where = ["src"]
-include = ["nats*"]
-exclude = ["scripts", "tests"]
-namespaces = false