fix(wiki): correct stale references across integration and security pages (broken extras, _activate_ordered rename)
docs: update wiki for v0.3.0 and v0.4.0 - New pages: Security, Extensions - Updated: Home, BasePlugin, PluginManager, Configuration, Lifecycle, FastAPI-Integration, Changelog - Documented all 17 feature points across both releases Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>