docs: add project milestone summary and first-user acquisition strategy

[Copilot]

The issue requested a concise project status overview — what's shipped, what's still placeholder, what needs hardening — plus a concrete strategy for reaching the first visually-impaired user.

Changes

• docs/milestone.md — new document covering:

  • Shipped: auth, dual-role system, help-request lifecycle, file uploads, notifications, feedback, moderation, 21 passing tests, CI/CD, Expo cross-platform frontend
  • Placeholder / not started: STT, TTS, image AI description (all core features), volunteer push notifications, WebSocket real-time messaging, production deployment
  • Needs attention: hardcoded SECRET_KEY, wildcard CORS, missing screen-reader / voice-navigation adaptation, no real-time delivery, volunteer notifications wired but empty
  • First-user strategy: WeChat/QQ disability communities, Xiaohongshu/Bilibili demo, in-person visits to blind schools and massage centers, local 残联 partnership; lower barrier via web-first + voice-guided onboarding + dedicated beta feedback group

• .gitignore — removed /docs entry so documentation is tracked in git

Original prompt

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This section details on the original issue you should resolve

<issue_title>帮我总结一下当前项目的里程碑程度，做了哪些事，还有哪些事没有做，还有什么地方需要优化的。 我们的项目如何获得第一个视觉障碍用户，以便获得真实世界的反馈</issue_title>
<issue_description>文字要尽可能精炼，简单易懂，不要说废话。</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 帮我总结一下当前项目的里程碑程度，做了哪些事，还有哪些事没有做，还有什么地方需要优化的。 我们的项目如何获得第一个视觉障碍用户，以便获得真实世界的反馈 #18

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