Add custom device

src/main/java/be/seeseepuff/pcinv/models/CustomAsset.java

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+package be.seeseepuff.pcinv.models;
+
+import be.seeseepuff.pcinv.meta.*;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * Represents a CPU or similar device.
+ */
+@Getter
+@Setter
+@Entity
+@AssetInfo(
+		displayName = "Custom Device",
+		pluralName = "Custom Devices",
+		type = "custom"
+)
+@Table(name = "custom_assets")
+public class CustomAsset implements Asset
+{
+	@Id
+	@GeneratedValue
+	private long id;
+
+	@OneToOne(orphanRemoval = true)
+	private GenericAsset asset;
+}

src/main/java/be/seeseepuff/pcinv/repositories/CustomRepository.java

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+package be.seeseepuff.pcinv.repositories;
+
+import be.seeseepuff.pcinv.models.CustomAsset;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+@SuppressWarnings("unused")
+public interface CustomRepository extends JpaRepository<CustomAsset, Long>, AssetRepository<CustomAsset> {
+    @Override
+    default Class<CustomAsset> getAssetType() {
+        return CustomAsset.class;
+    }
+}