feat(social): add SkillStar and SkillRating entities and repositories

server/skillhub-domain/src/main/java/com/iflytek/skillhub/domain/social/SkillRating.java

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+package com.iflytek.skillhub.domain.social;
+
+import jakarta.persistence.*;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "skill_rating",
+    uniqueConstraints = @UniqueConstraint(columnNames = {"skill_id", "user_id"}))
+public class SkillRating {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "skill_id", nullable = false)
+    private Long skillId;
+
+    @Column(name = "user_id", nullable = false)
+    private String userId;
+
+    @Column(nullable = false)
+    private Short score;
+
+    @Column(name = "created_at", nullable = false)
+    private LocalDateTime createdAt = LocalDateTime.now();
+
+    @Column(name = "updated_at", nullable = false)
+    private LocalDateTime updatedAt = LocalDateTime.now();
+
+    protected SkillRating() {}
+
+    public SkillRating(Long skillId, String userId, short score) {
+        if (score < 1 || score > 5) throw new IllegalArgumentException("Score must be 1-5");
+        this.skillId = skillId;
+        this.userId = userId;
+        this.score = score;
+    }
+
+    public void updateScore(short newScore) {
+        if (newScore < 1 || newScore > 5) throw new IllegalArgumentException("Score must be 1-5");
+        this.score = newScore;
+        this.updatedAt = LocalDateTime.now();
+    }
+
+    // getters
+    public Long getId() { return id; }
+    public Long getSkillId() { return skillId; }
+    public String getUserId() { return userId; }
+    public Short getScore() { return score; }
+    public LocalDateTime getCreatedAt() { return createdAt; }
+    public LocalDateTime getUpdatedAt() { return updatedAt; }
+}

server/skillhub-domain/src/main/java/com/iflytek/skillhub/domain/social/SkillRatingRepository.java

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+package com.iflytek.skillhub.domain.social;
+
+import java.util.Optional;
+
+public interface SkillRatingRepository {
+    SkillRating save(SkillRating rating);
+    Optional<SkillRating> findBySkillIdAndUserId(Long skillId, String userId);
+    double averageScoreBySkillId(Long skillId);
+    int countBySkillId(Long skillId);
+}

server/skillhub-domain/src/main/java/com/iflytek/skillhub/domain/social/SkillStar.java

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+package com.iflytek.skillhub.domain.social;
+
+import jakarta.persistence.*;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "skill_star",
+    uniqueConstraints = @UniqueConstraint(columnNames = {"skill_id", "user_id"}))
+public class SkillStar {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "skill_id", nullable = false)
+    private Long skillId;
+
+    @Column(name = "user_id", nullable = false)
+    private String userId;
+
+    @Column(name = "created_at", nullable = false)
+    private LocalDateTime createdAt = LocalDateTime.now();
+
+    protected SkillStar() {}
+
+    public SkillStar(Long skillId, String userId) {
+        this.skillId = skillId;
+        this.userId = userId;
+    }
+
+    // getters
+    public Long getId() { return id; }
+    public Long getSkillId() { return skillId; }
+    public String getUserId() { return userId; }
+    public LocalDateTime getCreatedAt() { return createdAt; }
+}

server/skillhub-domain/src/main/java/com/iflytek/skillhub/domain/social/SkillStarRepository.java

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+package com.iflytek.skillhub.domain.social;
+
+import java.util.Optional;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+
+public interface SkillStarRepository {
+    SkillStar save(SkillStar star);
+    Optional<SkillStar> findBySkillIdAndUserId(Long skillId, String userId);
+    void delete(SkillStar star);
+    Page<SkillStar> findByUserId(String userId, Pageable pageable);
+    long countBySkillId(Long skillId);
+}

server/skillhub-infra/src/main/java/com/iflytek/skillhub/infra/jpa/JpaSkillRatingRepository.java

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+package com.iflytek.skillhub.infra.jpa;
+
+import com.iflytek.skillhub.domain.social.SkillRating;
+import com.iflytek.skillhub.domain.social.SkillRatingRepository;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.stereotype.Repository;
+import java.util.Optional;
+
+@Repository
+public interface JpaSkillRatingRepository extends JpaRepository<SkillRating, Long>, SkillRatingRepository {
+    Optional<SkillRating> findBySkillIdAndUserId(Long skillId, String userId);
+
+    @Query("SELECT COALESCE(AVG(r.score), 0) FROM SkillRating r WHERE r.skillId = :skillId")
+    double averageScoreBySkillId(Long skillId);
+
+    int countBySkillId(Long skillId);
+}

server/skillhub-infra/src/main/java/com/iflytek/skillhub/infra/jpa/JpaSkillStarRepository.java

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+package com.iflytek.skillhub.infra.jpa;
+
+import com.iflytek.skillhub.domain.social.SkillStar;
+import com.iflytek.skillhub.domain.social.SkillStarRepository;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+import java.util.Optional;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+
+@Repository
+public interface JpaSkillStarRepository extends JpaRepository<SkillStar, Long>, SkillStarRepository {
+    Optional<SkillStar> findBySkillIdAndUserId(Long skillId, String userId);
+    Page<SkillStar> findByUserId(String userId, Pageable pageable);
+    long countBySkillId(Long skillId);
+}