Migrate dependency management from pip to uv

- Add a uv workspace at the repository root covering all packages/kaya-* members
- Replace pip-compile requirements files with a committed uv.lock
- Remove redundant per-package dev extras
- Build and publish artifacts with uv build and uv publish in CI
- Update the README with uv sync/run/build commands

packages/kaya-session-memcache/pyproject.toml

@@ -26,11 +26,6 @@ dependencies = [
     "aiomcache>=0.8",
 ]
 
-[project.optional-dependencies]
-dev = [
-    "build", "mypy", "ipdb", "twine"
-]
-
 [project.urls]
 "Homepage" = "https://github.com/woggioni/kaya"
 "Bug Tracker" = "https://github.com/woggioni/kaya/issues"