docs: replace nine-feature overview figure with new SVG

[hutaobo]

Summary

Replaces the old raster nine-feature overview figure with the new vector SVG provided by the maintainer.

• Adds docs/_static/figures/pyxenium-nine-feature-overview.svg (1560×1040, ~260 KB) as the canonical figure.
• Updates the README Figure 1 to reference the SVG.
• Updates the two docs pages that embed the same figure (docs/index.md, docs/user-guide/nine-feature-overview.md) so the project stays consistent.
• Removes the now-orphaned pyxenium-nine-feature-overview.png (~2.1 MB).

Net: the same figure asset is swapped everywhere it appears; no dangling .png references remain.

🤖 Generated with Claude Code

Summary by Sourcery

在整个项目中，用新的 SVG 资源替换原有的九功能概览图。

Documentation（文档）:

• 更新 README 和文档页面，将原先的 PNG 九功能概览图替换为新的 SVG 九功能概览图。

Chores（杂项/维护）:

• 添加新的 SVG 概览图资源，并从文档的静态图片中移除已废弃的 PNG 图像。

Original summary in English

Summary by Sourcery

Replace the nine-feature overview figure across the project with a new SVG asset.

Documentation:

• Update README and documentation pages to embed the new SVG nine-feature overview figure instead of the previous PNG.

Chores:

• Add the new SVG figure asset and remove the obsolete PNG image from the docs static figures.

[sourcery-ai]

审阅者指南（在小型 PR 上折叠显示）

审阅者指南

用新的 SVG 资源替换现有的光栅九特性概览 PNG 图，并更新所有文档引用以确保一致性，同时移除已废弃的 PNG。

更新后的文档图像资源引用流程图

flowchart LR
  README[README.md]
  Index[docs/index.md]
  NineOverview[docs/user-guide/nine-feature-overview.md]
  SVG[pyxenium-nine-feature-overview.svg]

  README --> SVG
  Index --> SVG
  NineOverview --> SVG

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文件级变更

变更	详情	文件
在 README 和文档中将九特性概览图从 PNG 替换为 SVG，并相应地添加/移除资源。	将 README 图 1 的图像源从 PNG URL 更新为新的 SVG URL，同时保留替代文本和尺寸设定。 更新主文档索引和九特性概览用户指南中的图像指令，使其引用 SVG 资源而不是 PNG。 将新的 SVG 图像资源添加到 docs 静态图像目录中，作为九特性概览的规范版本。 移除旧的 PNG 图像资源，以防止出现孤立或悬空引用。	README.md docs/index.md docs/user-guide/nine-feature-overview.md docs/_static/figures/pyxenium-nine-feature-overview.svg

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Original review guide in English

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Replaces the existing raster nine-feature overview PNG figure with a new SVG asset and updates all documentation references to ensure consistency while removing the obsolete PNG.

Flow diagram for updated documentation figure asset references

flowchart LR
  README[README.md]
  Index[docs/index.md]
  NineOverview[docs/user-guide/nine-feature-overview.md]
  SVG[pyxenium-nine-feature-overview.svg]

  README --> SVG
  Index --> SVG
  NineOverview --> SVG

Loading

File-Level Changes

Change	Details	Files
Swap the nine-feature overview figure from PNG to SVG across the README and documentation, and add/remove assets accordingly.	Updated README Figure 1 image source from the PNG URL to the new SVG URL while preserving alt text and sizing. Updated figure directives in the main docs index and the nine-feature overview user guide to reference the SVG asset instead of the PNG. Added the new SVG figure asset into the docs static figures directory as the canonical version of the nine-feature overview. Removed the old PNG figure asset to prevent orphaned or dangling references.	README.md docs/index.md docs/user-guide/nine-feature-overview.md docs/_static/figures/pyxenium-nine-feature-overview.svg

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[sourcery-ai]

嘿，我已经审查了你的改动，一切看起来都很棒！

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Original comment in English

Hey - I've reviewed your changes and they look great!

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[Copilot]

Pull request overview

Swaps the project’s “nine-feature overview” figure from a large raster PNG to a new canonical SVG, updating all documentation entry points so they embed the same asset and removing the old PNG reference footprint.

Changes:

• Update README figure reference to the new SVG asset.
• Update MyST {figure} directives in docs/index.md and docs/user-guide/nine-feature-overview.md to reference the SVG.
• Replace the old PNG asset with the new SVG asset (no remaining .png references found in-repo).

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated no comments.

File	Description
README.md	Updates the README’s Figure 1 image source to the new SVG.
docs/index.md	Updates the landing-page figure directive to reference the new SVG.
docs/user-guide/nine-feature-overview.md	Updates the user-guide figure directive to reference the new SVG.

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