chore: 纳入 Cursor 项目规则并忽略本地运行时数据

补充 .cursor 规则/技能与记忆；gitignore 排除 backend/cmd/jiang13/data 与调试日志。

Co-authored-by: Cursor <cursoragent@cursor.com>

.cursor/user_preferences.md

@@ -0,0 +1,8 @@
+## User Preferences
+- Communication language: Chinese
+- Code style: maintain existing code if it has no issues; prioritize code规范 (code standards); avoid implementing scroll position restoration via snapshots (consider it a last-resort solution)
+- Frontend focus: visual presentation clarity and hierarchical organization of display elements; UI/UX optimization for mobile responsiveness and user-friendliness; mobile editor layout requires only publish bar and toolbar to be sticky at top, with title box, type, board, and tags not sticky
+- Sticker requirements: prefers high-quality image-based stickers (e.g., Feishu style) over handwritten SVG;颜文字 should be pure text without rendering/styling
+- SSR validation: uses AITDK SEO browser plugin's SSR check function to verify SSR status; expects clean view-source without unnecessary inline scripts
+- Project quality: requires genuine, clean SSR implementation with high-quality code
+- Frontend design: prefers dark Bento futuristic style (style C) but wants to reduce AI-like appearance; requests UI and layout reconstruction based on style C; dislikes current UI/UX design, considers it too ugly; does not want to use skeleton screens in pure SSR websites (F5 hard refresh should not show skeletons); values WCAG contrast standards (text ≥4.5:1, interactive controls ≥3:1) for color schemes; prefers high information density and visually appealing UI design