rename OTAMan → SIMple (v2.3.0)

- package pysim_otaman_server → pysim_simple_server; distribution and
  console script pysim-otaman-server → pysim-simple-server
- PWA branding SIMple: title, header, manifest, help EN/RU, GitHub links
- localStorage keys otaman_* → simple_* (clean break, no migration)
- export filenames simple-cards.json / simple-custom-files.json
- service worker cache simple-v189
- README/docs/setup/start scripts updated; no 'otaman' left in the tree

pysim_simple_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."
+    )