feat: 精油排序+容量显示+共享状态+注册日志+防误关

- 配方卡片精油按字母排序
- 配方卡片显示容量（单次/Xml）
- 管理员共享直接显示已共享
- 编辑overlay不会误关（去掉backdrop点击关闭）
- 注册记入活动日志
- 轮播分类已按tag_name匹配

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/main.py

@@ -355,6 +355,8 @@ def register(body: dict):
             "INSERT INTO users (username, token, role, display_name, password) VALUES (?, ?, ?, ?, ?)",
             (username, token, "viewer", display_name or username, hash_password(password))
         )
+        uid = conn.execute("SELECT id FROM users WHERE username = ?", (username,)).fetchone()
+        log_audit(conn, uid["id"] if uid else None, "register", "user", username, display_name or username, None)
         conn.commit()
     except Exception:
         conn.close()