Announce Bun 1.4 runtime for Functions and Sites

[atharvadeosthale]

What does this PR do?

• Adds the Bun 1.4 announcement blog post with build-time benchmarks (Bun 1.4 vs Bun 1.3 vs Node 26, Next.js app with 640 packages, 5 deployments per runtime on Appwrite Cloud)
• Adds a changelog entry for the release
• Updates the Functions runtimes docs page: adds bun-1.4, node-26, and dart-3.12 to the Cloud tab, and syncs the all-runtimes tab with missing versions across node, bun, deno, go, python, python-ml, dart, ruby, .NET, java, swift, kotlin, and flutter

Test plan

• Blog post and changelog entry render locally with cover images
• All internal links verified against the working tree
• bun run format and bun run optimize pass clean

[appwrite]

Appwrite Website

Project ID: 69d7efb00023389e8d27

Sites (1)

Site	Status	Logs	Preview	QR
website 69d7f2670014e24571ca	Ready	View Logs	Preview URL

Website (appwrite/website)

Project ID: 684969cb000a2f6c0a02

Sites (1)

Site	Status	Logs	Preview	QR
website 68496a17000f03d62013	Queued	View Logs	Preview URL

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