feat: 添加 Goal, GoalRelation, StudentGoal 三个数据模型

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- Goal: 目标表，支持存储学习目标
- GoalRelation: 目标自关联多对多表，支持 DAG 结构
- StudentGoal: 学员目标记录表，关联学员和目标

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hmo

2026-04-23 20:10:08 +08:00

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