* feat(plugin): add pages field to plugin list API response
Include discovered page names for each plugin in the /api/plugin/get
response, so the frontend can determine whether a plugin has a WebUI
without an extra detail request.
* feat(webui): add direct WebUI access button on plugin cards
- Add "open-webui" button on plugin cards when plugin has pages
- Navigate to plugin's first page directly from the card
- Adjust PluginPagePage iframe height for better UX
- Add i18n labels (zh-CN/en-US/ru-RU)
* perf(plugin): use asyncio.gather for concurrent page discovery
Replace sequential await loop with concurrent processing to avoid
blocking on disk I/O when discovering plugin pages.
* fix(webui): disable open plugin UI button when plugin is deactivated
Prevent navigation to a disabled plugin's WebUI page which would
result in an error.
* test: update plugin API tests to match pages field in list response
- test_plugin_get_excludes_scanned_pages: expect pages field now present
- test_plugins: use name-based lookup instead of exact count assertion
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Co-authored-by: lxfight <lxfight@192.168.5.50>
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