feat(realtime): introduce message-based protocol for subscriptions

[eldadfux]

• Added a new blog post detailing the transition to a single persistent WebSocket for Appwrite Realtime, allowing for incremental subscription changes without reconnecting.
• Updated changelog to reflect the new Realtime features, including per-subscription lifecycle management and in-place updates.
• Enhanced documentation across various SDKs to clarify subscription management and lifecycle handling.

This update improves performance and usability for developers using Appwrite's Realtime features.

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[greptile-apps]

Greptile Summary

This PR introduces a new blog post and changelog entry announcing the message-based Realtime protocol (single persistent WebSocket with incremental subscription changes), and updates the Realtime docs (subscribe, channels, queries, overview) to reflect the new update(), unsubscribe(), and disconnect() lifecycle APIs. It also corrects the Android Kotlin import path from io.appwrite.extensions.Channel to io.appwrite.Channel across all affected doc pages.

Confidence Score: 5/5

Safe to merge — only documentation and blog content changes, no production code affected

All findings are P2 style suggestions. The single inconsistency (missing await on disconnect() in the blog post Web snippet) is a docs-only issue and does not affect any runtime behaviour.

No files require special attention beyond the one inline suggestion on the blog post

Important Files Changed

Filename	Overview
src/routes/blog/post/announcing-message-based-realtime-sdk/+page.markdoc	New announcement blog post covering message-based realtime protocol; one Web example omits await on disconnect() inconsistently with all other platforms
src/routes/changelog/(entries)/2026-04-29.markdoc	New changelog entry summarising the persistent-WebSocket and message-based subscription changes; content is accurate and well-scoped
src/routes/docs/apis/realtime/+page.markdoc	Updated Android Kotlin import path (io.appwrite.Channel replaces io.appwrite.extensions.Channel) and minor prose clarifications; no issues
src/routes/docs/apis/realtime/channels/+page.markdoc	Import path update only (io.appwrite.Channel); no issues
src/routes/docs/apis/realtime/queries/+page.markdoc	Import path update only (io.appwrite.Channel); no issues
src/routes/docs/apis/realtime/subscribe/+page.markdoc	Significant documentation update: new Update/Unsubscribe/Disconnect sections, import path corrections, and Apple unsubscribe example completed with endpoint/project; all platforms look consistent

_{Reviews (4): Last reviewed commit: "optimize" | Re-trigger Greptile}