feat: 255자 넘어가야 하는 필드 columnDefinition = "TEXT" 추가

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/ChatCharacter.kt

@@ -2,6 +2,7 @@ package kr.co.vividnext.sodalive.chat.character
 
 import kr.co.vividnext.sodalive.common.BaseEntity
 import javax.persistence.CascadeType
+import javax.persistence.Column
 import javax.persistence.Entity
 import javax.persistence.FetchType
 import javax.persistence.OneToMany
@@ -14,9 +15,11 @@ class ChatCharacter(
     val name: String,
 
     // 캐릭터 설명
+    @Column(columnDefinition = "TEXT", nullable = false)
     val description: String,
 
     // AI 시스템 프롬프트
+    @Column(columnDefinition = "TEXT", nullable = false)
     val systemPrompt: String,
 
     // 나이
@@ -29,12 +32,14 @@ class ChatCharacter(
     val mbti: String? = null,
 
     // 말투 패턴 설명
+    @Column(columnDefinition = "TEXT")
     val speechPattern: String? = null,
 
     // 대화 스타일
     val speechStyle: String? = null,
 
     // 외모 설명
+    @Column(columnDefinition = "TEXT")
     val appearance: String? = null,
 
     val isActive: Boolean = true

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/ChatCharacterBackground.kt

@@ -1,6 +1,7 @@
 package kr.co.vividnext.sodalive.chat.character
 
 import kr.co.vividnext.sodalive.common.BaseEntity
+import javax.persistence.Column
 import javax.persistence.Entity
 import javax.persistence.FetchType
 import javax.persistence.JoinColumn
@@ -16,6 +17,7 @@ class ChatCharacterBackground(
     val topic: String,
 
     // 배경 설명
+    @Column(columnDefinition = "TEXT", nullable = false)
     val description: String,
 
     @ManyToOne(fetch = FetchType.LAZY)

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/ChatCharacterMemory.kt

@@ -1,6 +1,7 @@
 package kr.co.vividnext.sodalive.chat.character
 
 import kr.co.vividnext.sodalive.common.BaseEntity
+import javax.persistence.Column
 import javax.persistence.Entity
 import javax.persistence.FetchType
 import javax.persistence.JoinColumn
@@ -16,6 +17,7 @@ class ChatCharacterMemory(
     val title: String,
 
     // 기억 내용
+    @Column(columnDefinition = "TEXT", nullable = false)
     val content: String,
 
     // 감정