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

pysim_otaman_server/shell.py

@@ -0,0 +1,22 @@
+import importlib.util
+import os
+import sys
+
+
+def load_pysim_app():
+    import pySim
+    pysim_dir = os.path.dirname(pySim.__file__)
+    candidates = [
+        os.path.join(os.path.dirname(pysim_dir), 'pySim-shell.py'),
+        os.path.join(os.path.dirname(sys.executable), 'pySim-shell.py'),
+    ]
+    for path in candidates:
+        if os.path.exists(path):
+            spec = importlib.util.spec_from_file_location("pySim_shell", path)
+            mod = importlib.util.module_from_spec(spec)
+            spec.loader.exec_module(mod)
+            return mod
+    raise ImportError(
+        "pySim-shell.py not found. Make sure pysim is installed "
+        "(pip install pysim) and pySim-shell.py is on the PATH."
+    )