feat(jpa): add JPA entities and repositories aligned to Flyway; chore(deps): remove unused AMQP deps

src/main/java/com/mosquito/project/persistence/entity/ApiKeyEntity.java

@@ -0,0 +1,47 @@
+package com.mosquito.project.persistence.entity;
+
+import jakarta.persistence.*;
+import java.time.OffsetDateTime;
+
+@Entity
+@Table(name = "api_keys")
+public class ApiKeyEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false, length = 255)
+    private String name;
+
+    @Column(name = "key_hash", nullable = false, length = 255, unique = true)
+    private String keyHash;
+
+    @Column(nullable = false, length = 255)
+    private String salt;
+
+    @Column(name = "created_at")
+    private OffsetDateTime createdAt;
+
+    @Column(name = "revoked_at")
+    private OffsetDateTime revokedAt;
+
+    @Column(name = "last_used_at")
+    private OffsetDateTime lastUsedAt;
+
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+    public String getName() { return name; }
+    public void setName(String name) { this.name = name; }
+    public String getKeyHash() { return keyHash; }
+    public void setKeyHash(String keyHash) { this.keyHash = keyHash; }
+    public String getSalt() { return salt; }
+    public void setSalt(String salt) { this.salt = salt; }
+    public OffsetDateTime getCreatedAt() { return createdAt; }
+    public void setCreatedAt(OffsetDateTime createdAt) { this.createdAt = createdAt; }
+    public OffsetDateTime getRevokedAt() { return revokedAt; }
+    public void setRevokedAt(OffsetDateTime revokedAt) { this.revokedAt = revokedAt; }
+    public OffsetDateTime getLastUsedAt() { return lastUsedAt; }
+    public void setLastUsedAt(OffsetDateTime lastUsedAt) { this.lastUsedAt = lastUsedAt; }
+}
+