Initial commit: mail-server with WebFlux backend and Angular v22 Synthwave frontend

Co-authored-by: Junie <junie@jetbrains.com>

backend/src/main/java/com/mailserver/domain/Folder.java

@@ -0,0 +1,47 @@
+package com.mailserver.domain;
+
+import org.springframework.data.annotation.Id;
+import org.springframework.data.relational.core.mapping.Column;
+import org.springframework.data.relational.core.mapping.Table;
+
+import java.time.Instant;
+
+@Table("folders")
+public class Folder {
+
+    @Id
+    private Long id;
+
+    @Column("user_id")
+    private Long userId;
+
+    @Column("name")
+    private String name;
+
+    @Column("message_count")
+    private Integer messageCount = 0;
+
+    @Column("unread_count")
+    private Integer unreadCount = 0;
+
+    @Column("created_at")
+    private Instant createdAt;
+
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+
+    public Long getUserId() { return userId; }
+    public void setUserId(Long userId) { this.userId = userId; }
+
+    public String getName() { return name; }
+    public void setName(String name) { this.name = name; }
+
+    public Integer getMessageCount() { return messageCount; }
+    public void setMessageCount(Integer messageCount) { this.messageCount = messageCount; }
+
+    public Integer getUnreadCount() { return unreadCount; }
+    public void setUnreadCount(Integer unreadCount) { this.unreadCount = unreadCount; }
+
+    public Instant getCreatedAt() { return createdAt; }
+    public void setCreatedAt(Instant createdAt) { this.createdAt = createdAt; }
+}