Merge pysim-otaman-server into otaman (monorepo, v1.7.0)

- Move PWA into frontend/; server package at pysim_otaman_server/
- Server now serves the PWA (same origin -> no CORS/PNA): static file handler
  + --web-dir flag + injects window.PYSIM_EMBEDDED marker into index.html
- Frontend defaults to relative API base when embedded (pysimBase = '')
- Version 1.7.0 aligned: server.py VERSION, pyproject.toml, PWA header
- SW cache bump otaman-v7 -> otaman-v8
- Docs: combined README + docs/api.md endpoint reference; update links
- Fix stale package.json repository URL

pyproject.toml

@@ -0,0 +1,15 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "pysim-otaman-server"
+version = "1.7.0"
+description = "HTTP REST server wrapping pysim for the OTAMan PWA"
+requires-python = ">=3.8"
+# pysim is a git-only dependency installed explicitly by setup.bat/setup.sh.
+# Declaring it here would make pip resolve its full tree (including the SMPP
+# bridge -> Twisted -> twisted-iocpsupport, which needs MSVC on Windows).
+
+[project.scripts]
+pysim-otaman-server = "pysim_otaman_server.__main__:main"