[no bump] Ghost Mode: AyuGram's ghost mode with per-account and per-chat settings

Read receipts, story views, typing and online status are held back per
the options; read on interact, scheduled and silent sending as in AyuGram.
Every option resolves chat -> account -> global; forum topics follow
their group. Settings live in the plugin page, a chat/profile menu popup,
and a drawer row for the current account.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/development.md

@@ -17,8 +17,15 @@
 plugin.json         single source of truth for plugin metadata
 src/                the plugin, written as an ordinary Python package
   main.py           entry module — exactly one BasePlugin subclass, absolute imports only
-  greeting/         sample package (proves relative + cross-module imports survive bundling)
-  textutil.py       sample top-level sibling module
+  features.py       the ghost mode options and their defaults
+  prefs.py          storage and resolution: chat -> account -> global
+  network.py        request hooks: reads, stories, typing, online status, read on interact
+  sending.py        scheduled and silent sending, forward hook, scheduled-screen guard
+  menus.py          chat/profile/message/drawer menu items, the chat and account dialogs
+  drawer.py         the drawer row for drawer layouts without a Plugins entry
+  settings_page.py  the plugin settings screen and the per-account pages
+  peers.py          accounts, dialog ids and names
+  hooking.py        Xposed and UI-thread helpers
 tools/
   bundle.py         compiles plugin.json + src/ into dist/<id>.plugin
   devclient.py      speaks the on-device dev-server protocol (127.0.0.1:42690)