fix(telegram): edit streamed previews in place as rich (Bot API 10.1) (#46890)

Streamed Telegram replies that finalize through editMessageText were
converted to MarkdownV2, which has no table syntax and rewrites pipe
tables into bullet lists — users saw a table while streaming that
collapsed to a list at the last moment.

Finalize now edits the existing preview IN PLACE via Bot API 10.1's
editMessageText rich_message parameter when the content has constructs
the legacy path degrades (tables, task lists, <details>, block math).
No fresh send + delete, so no duplicate-preview flicker — the reason
#46206 reverted the fresh-final re-send path. prefers_fresh_final_streaming
stays False; the in-place edit replaces it.

- _needs_rich_rendering(): rich reserved for table/task-list/details/math
  (adapted from #45995, @YonganZhang); plain replies stay on MarkdownV2.
- _try_edit_rich(): editMessageText + rich_message via do_api_request,
  mirroring _try_send_rich's fallback/latch/transient contract.
- edit_message finalize tries rich in place before the 4,096 overflow
  pre-flight (rich cap is 32,768), falling back to legacy on rejection.
- rich_messages default flipped back to True (DEFAULT_CONFIG + adapter).
- docs (en + zh-Hans) + cli-config example updated to default-on.

Closes the root cause behind #45911 / #46009.

cli-config.yaml.example

@@ -724,7 +724,7 @@ platform_toolsets:
 #     # allowed_chats: ["-1001234567890"]
 #     extra:
 #       disable_link_previews: false  # Set true to suppress Telegram URL previews in bot messages
-#       rich_messages: false          # Opt in to Bot API 10.1 rich messages; default uses legacy MarkdownV2
+#       rich_messages: false          # Bot API 10.1 rich messages (tables/task lists/details/math); default true, set false to force legacy MarkdownV2
 #
 # Discord-specific settings (config.yaml top-level, not under platforms:):
 #