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

frontend/manifest.json

@@ -0,0 +1,13 @@
+{
+  "name": "OTAMan",
+  "short_name": "OTAMan",
+  "description": "Offline APDU helper for SIM/USIM/RAM commands",
+  "start_url": "index.html",
+  "display": "standalone",
+  "background_color": "#fafafa",
+  "theme_color": "#2563eb",
+  "icons": [
+    { "src": "icon-192.png", "sizes": "192x192", "type": "image/png" },
+    { "src": "icon-512.png", "sizes": "512x512", "type": "image/png" }
+  ]
+}