Add project icon to README

[naporin0624]

Summary

• Add modern minimalist project icon for y-durableobjects
• Display icon prominently in README header for enhanced branding

Changes

• New asset: assets/y-durableobjects-icon.png - HD icon (1024x1024) generated with GPT-image-1
• README update: Added centered icon display above project title

Design Features

• Stylized "Y" representing Yjs integration
• Network nodes showing real-time collaboration concept
• Cloud elements for Cloudflare Workers
• Orange/amber color scheme on dark background
• Clean, modern aesthetic suitable for technical documentation

Test plan

• Verify icon displays correctly in README
• Check icon file size and format (PNG, 1.4MB)
• Ensure proper alignment and sizing (128x128 display)

🤖 Generated with Claude Code

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2178b74

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[cloudflare-workers-and-pages]

Deploying yjs-worker with    Cloudflare Pages

Latest commit:	2178b74
Status:	✅  Deploy successful!
Preview URL:	https://2e437665.yjs-worker.pages.dev
Branch Preview URL:	https://add-project-icon.yjs-worker.pages.dev

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[pkg-pr-new]

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npm i https://pkg.pr.new/napolab/y-durableobjects@64

commit: 2178b74

[github-actions]

📊 Package size report   0.1%↑

File	Before	After
README.md	10.1 kB	1%↑10.2 kB
Total (Includes all files)	90.5 kB	0.1%↑90.6 kB
Tarball size	18.3 kB	0.4%↑18.4 kB

Unchanged files

File	Size
dist/chunk-44JZXIF7.js	379 B
dist/chunk-44JZXIF7.js.map	784 B
dist/chunk-GLWCU3YD.cjs	473 B
dist/chunk-GLWCU3YD.cjs.map	1.1 kB
dist/helpers/upgrade.cjs	216 B
dist/helpers/upgrade.cjs.map	258 B
dist/helpers/upgrade.d.cts	273 B
dist/helpers/upgrade.d.ts	273 B
dist/helpers/upgrade.js	107 B
dist/helpers/upgrade.js.map	71 B
dist/index.cjs	12.0 kB
dist/index.cjs.map	18.1 kB
dist/index.d.cts	4.8 kB
dist/index.d.ts	4.8 kB
dist/index.js	10.4 kB
dist/index.js.map	22.3 kB
LICENSE	1.1 kB
package.json	3.0 kB

_{🤖 This report was automatically generated by pkg-size-action}