Merge simtrace-analyser-server into simtrace2_pysniff.server

Add simtrace2-pysniff-server CLI — HTTP API for simtrace-analyser PWA.
Two capture modes: GSMTAP UDP listener (compatible with simtrace2-sniff)
or direct SIMtrace2 hardware capture. SQLite storage with sessions +
messages tables. REST API with CORS.

server/ sub-package: database.py, capture.py, server.py, __main__.py

README updated with server usage section.
pyproject.toml: simtrace2-pysniff-server script entry added.

pyproject.toml

@@ -15,6 +15,7 @@ dependencies = [
 
 [project.scripts]
 simtrace2-pysniff = "simtrace2_pysniff.__main__:main"
+simtrace2-pysniff-server = "simtrace2_pysniff.server.__main__:main"
 
 [tool.setuptools.packages.find]
 include = ["simtrace2_pysniff*"]