Add Ad model, DAO, and service for managing advertisements

hibernate-project/src/main/java/com/humanbooster/dao/AdDao.java

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+package com.humanbooster.dao;
+
+import com.humanbooster.model.Ad;
+import org.hibernate.SessionFactory;
+
+public class AdDao extends GenericDaoImpl<Ad, Long> {
+
+    public AdDao(SessionFactory sessionFactory) {
+        super(sessionFactory, Ad.class);
+    }
+}

hibernate-project/src/main/java/com/humanbooster/model/Ad.java

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+package com.humanbooster.model;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+
+import java.time.LocalDate;
+
+@Entity
+public class Ad extends Publication {
+
+    @Column(nullable = false)
+    private LocalDate expirationDate;
+
+    @Column(nullable = false)
+    private String contactEmail;
+
+    private int price;
+
+    public Ad() {
+    }
+
+    public Ad(String title, String content, LocalDate publishDate, LocalDate expirationDate, String contactEmail, int price) {
+        super(title, content, publishDate);
+        this.expirationDate = expirationDate;
+        this.contactEmail = contactEmail;
+        this.price = price;
+    }
+
+    public LocalDate getExpirationDate() {
+        return expirationDate;
+    }
+
+    public void setExpirationDate(LocalDate expirationDate) {
+        this.expirationDate = expirationDate;
+    }
+
+    public String getContactEmail() {
+        return contactEmail;
+    }
+
+    public void setContactEmail(String contactEmail) {
+        this.contactEmail = contactEmail;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+}

hibernate-project/src/main/java/com/humanbooster/service/AdService.java

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+package com.humanbooster.service;
+
+import com.humanbooster.dao.AdDao;
+import com.humanbooster.model.Ad;
+
+import java.util.List;
+
+public record AdService (AdDao adDao) {
+
+    public void createAd(Ad ad) {
+        adDao.create(ad);
+    }
+
+    public Ad getAdById(Long id) {
+        return adDao.read(id);
+    }
+
+    public void updateAd(Ad ad) {
+        adDao.update(ad);
+    }
+
+    public void deleteAd(Long id) {
+        adDao.delete(id);
+    }
+
+    public List<Ad> getAllAds() {
+        return adDao.findAll();
+    }
+}