chore: 从版本控制中移除 CLAUDE.md 文件

- 使用 git rm --cached 移除文件跟踪
- 本地文件保留，但不再提交到版本控制

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

-<claude-mem-context>
-# Recent Activity
-
-<!-- This section is auto-generated by claude-mem. Edit content outside the tags. -->
-
-### Feb 5, 2026
-
-| ID | Time | T | Title | Read |
-|----|------|---|-------|------|
-| #1550 | 8:11 PM | 🔄 | Increased Card Cover Image Height | ~155 |
-| #1548 | " | 🔄 | Enhanced Activity Time Display with Label Wrapper | ~230 |
-| #1545 | " | 🟣 | Implemented CheckinMap Activity Listing Page | ~325 |
-| #1538 | 8:03 PM | 🟣 | Created CheckinMap Page Configuration | ~171 |
-</claude-mem-context>
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