docs(wiki): rewrite the docs for 0.1.16, in English and Chinese

The docs still described 0.1.11: seven engines, six data sources, a
Quick start whose `vibe-trading serve` step opens no UI after a PyPI
install. Every count on the pages is now measured from the code (28
sources, 11 engines, 90 skills, 30 presets, 74 MCP tools, 18 brokers,
462 alphas), and five pages are new: Troubleshooting (no_progress,
"0 steps", cut figures, bare US tickers), Checked numbers, Alpha Zoo,
Brokers and live trading, Web UI and API.

Chinese pages are served at /docs/zh/<page>. The header toggle switches
language and remembers it; a first visit from a Chinese browser opens
the Chinese pages. The version selector offered 0.1.7-0.1.11 while
rendering one content set; it now lists only 0.1.16.
wiki/scripts/check_docs_parity.mjs (run in CI) fails when the two
languages differ in pages, sections, order, empty fields or internal
links. A #section in a docs URL now scrolls to it.

Landing page: "Seven engines" -> eleven, the uv tab no longer ends in
`serve`, and a 中文文档 button.

wiki/_redirects

@@ -5,5 +5,8 @@
 /alpha /alpha-library/ 302
 /alpha-library /alpha-library/ 302
 /research-lab /research-lab/ 302
+/docs/zh /docs/zh/getting-started/vibe-trading-overview 302
+/docs/zh/ /docs/zh/getting-started/vibe-trading-overview 302
 /docs/latest/* /docs/ 200
+/docs/zh/* /docs/ 200
 /docs/0.1.7/* /docs/ 200