docs: apply reviewed wiki editorial corrections
docs: add ASP.NET hosting guide and clarify SDK behavior
docs: apply wiki editorial audit findings Apply 107 findings across 49 pages, including revised wording, sentence case headings, and event terminology. Leave the deferred MP4 metadata finding unchanged.
docs: editorial cleanup of platform, plugin, media, and macro SDK guides
docs: add plugin engine extensions conceptual page Conceptual page for the Plugin SDK engine extensions: creating entities with a chosen GUID, controlling the plugin root area, encrypting plugin data, and server-side video and Security Center SaaS operations. Add its sidebar entry.