Hithomelabs/CFTunnels#114: Add JavaDoc to User entity

src/main/java/com/hithomelabs/CFTunnels/Entity/User.java

@@ -1,4 +1,5 @@
 package com.hithomelabs.CFTunnels.Entity;
+
 import jakarta.persistence.*;
 import jakarta.validation.constraints.Size;
 import lombok.AllArgsConstructor;
@@ -8,6 +9,26 @@ import lombok.Setter;
 
 import java.util.UUID;
 
+/**
+ * JPA Entity representing a user in the system.
+ * 
+ * <p>This entity stores user information synced from the OIDC provider
+ * during authentication. Users are assigned roles that determine their
+ * access levels to the API endpoints.</p>
+ * 
+ * <p><b>Database Table:</b> {@code users}</p>
+ * 
+ * <p><b>Roles:</b></p>
+ * <ul>
+ *   <li>USER - Basic access to view tunnels</li>
+ *   <li>DEVELOPER - Can create/modify mappings</li>
+ *   <li>APPROVER - Can approve/reject requests</li>
+ *   <li>ADMIN - Full access including tunnel configuration</li>
+ * </ul>
+ * 
+ * @see Request
+ * @see Mapping
+ */
 @Entity
 @Getter
 @Setter
@@ -15,15 +36,32 @@ import java.util.UUID;
 @AllArgsConstructor
 @Table(name = "users")
 public class User {
+
+    /**
+     * Unique identifier for the user (UUID).
+     * 
+     * <p>This corresponds to the user's ID in the OIDC provider.</p>
+     */
     @Id
     @GeneratedValue
     @Column(columnDefinition = "uuid", insertable = false, updatable = false, nullable = false)
     private UUID id;
 
+    /**
+     * User's display name.
+     * 
+     * <p>This is typically the full name from the OIDC provider.</p>
+     */
     @Column(length = 50, nullable = false)
     @Size(max = 50)
     private String name;
 
+    /**
+     * User's email address.
+     * 
+     * <p>Used as the unique identifier for authentication
+     * and for associating users with their roles.</p>
+     */
     @Column(length = 50, nullable = false)
     @Size(max = 50)
     private String email;