Make the demo extras self-contained

Move rich and click into the demo extras so `pip install "python-snap7[demo]"`
actually gets you a working demo — the previous split forced users to
install [cli,demo] to unlock the rich live dashboard, which nobody
would have guessed. rich is still listed under cli too; pip dedupes
and it keeps the cli extras independent for anyone who wants the CLI
without the demo.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: gijzelaerr

pyproject.toml

@@ -35,7 +35,7 @@ Documentation = "https://python-snap7.readthedocs.io/en/latest/"
 test = ["pytest", "pytest-asyncio", "pytest-cov", "pytest-html", "hypothesis", "mypy", "types-setuptools", "ruff", "tox", "tox-uv", "types-click", "uv"]
 s7commplus = ["cryptography"]
 cli = ["rich", "click" ]
-demo = ["psutil"]
+demo = ["psutil", "rich", "click"]
 doc = ["sphinx", "sphinx_rtd_theme"]
 discovery = ["pnio-dcp"]
 

snap7/cli.py

@@ -157,10 +157,9 @@ def server(port: int) -> None:
 def demo(port: int, refresh: float, plain: bool) -> None:
     """Start a live S7 server that exposes real host metrics on DB1.
 
-    Requires the ``demo`` extras (psutil). For the live display, also
-    install the ``cli`` extras (rich):
+    Install with:
 
-        pip install "python-snap7[cli,demo]"
+        pip install "python-snap7[demo]"
     """
     try:
         from snap7.demo import run_demo

snap7/demo.py

@@ -6,12 +6,15 @@
 write to. An optional :mod:`rich` live display shows the current values
 and logs any writes with a timestamp.
 
-This is a demo, not a production tool. Requires the ``demo`` extras
-(``psutil``, plus ``rich`` from the ``cli`` extras for the live display)::
+This is a demo, not a production tool. Install with::
 
-    pip install "python-snap7[cli,demo]"
+    pip install "python-snap7[demo]"
     s7 demo --port 10102
 
+The ``demo`` extras pull in everything the demo needs: ``psutil`` for
+metrics, ``rich`` for the live dashboard, and ``click`` for the CLI
+entry point.
+
 DB layout
 ---------