feat(api): add REST controllers, services, entities and 15-min timeline grid

src/main/java/com/caspos/domain/Reservation.java

@@ -0,0 +1,72 @@
+package com.caspos.domain;
+
+import jakarta.persistence.*;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+@Entity
+@Table(name = "reservations")
+public class Reservation {
+
+    public enum Status {
+        PENDING, CONFIRMED, ARRIVED, FINISHED, NO_SHOW, CANCELLED
+    }
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.UUID)
+    private UUID id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "guest_id")
+    private Guest guest;
+
+    @ManyToMany
+    @JoinTable(
+        name = "reservation_table_assignments",
+        joinColumns = @JoinColumn(name = "reservation_id"),
+        inverseJoinColumns = @JoinColumn(name = "table_id")
+    )
+    private List<RestaurantTable> tables = new ArrayList<>();
+
+    @Column(name = "start_time", nullable = false)
+    private OffsetDateTime startTime;
+
+    @Column(name = "end_time", nullable = false)
+    private OffsetDateTime endTime;
+
+    @Column(name = "guest_count", nullable = false)
+    private int guestCount;
+
+    @Enumerated(EnumType.STRING)
+    @Column(name = "status", nullable = false, length = 30)
+    private Status status = Status.CONFIRMED;
+
+    @Column(name = "special_requests", columnDefinition = "TEXT")
+    private String specialRequests;
+
+    @Column(name = "created_at")
+    private Instant createdAt = Instant.now();
+
+    public UUID getId() { return id; }
+    public Guest getGuest() { return guest; }
+    public List<RestaurantTable> getTables() { return tables; }
+    public OffsetDateTime getStartTime() { return startTime; }
+    public OffsetDateTime getEndTime() { return endTime; }
+    public int getGuestCount() { return guestCount; }
+    public Status getStatus() { return status; }
+    public String getSpecialRequests() { return specialRequests; }
+    public Instant getCreatedAt() { return createdAt; }
+
+    public void setId(UUID id) { this.id = id; }
+    public void setGuest(Guest guest) { this.guest = guest; }
+    public void setTables(List<RestaurantTable> tables) { this.tables = tables; }
+    public void setStartTime(OffsetDateTime startTime) { this.startTime = startTime; }
+    public void setEndTime(OffsetDateTime endTime) { this.endTime = endTime; }
+    public void setGuestCount(int guestCount) { this.guestCount = guestCount; }
+    public void setStatus(Status status) { this.status = status; }
+    public void setSpecialRequests(String specialRequests) { this.specialRequests = specialRequests; }
+    public void setCreatedAt(Instant createdAt) { this.createdAt = createdAt; }
+}