fix: Disable Spring AI schema auto-initialization for PostgreSQL

Spring AI was attempting to execute H2-specific schema (schema-h2.sql) on PostgreSQL,
causing infinite restart loop due to unsupported CLOB type.

Changes:
- Set spring.sql.init.mode to never in application.yml
- Add spring.ai.vectorstore.jdbc.initialize-schema: false in application-prod.yml
- Remove schema-locations pointing to H2 schema

Fixes database initialization error: type "clob" does not exist

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: JIWONKIMS

src/main/resources/application-prod.yml

@@ -15,6 +15,11 @@ spring:
         format_sql: true
         dialect: org.hibernate.dialect.PostgreSQLDialect
 
+  ai:
+    vectorstore:
+      jdbc:
+        initialize-schema: false
+
   data:
     redis:
       host: ${REDIS_HOST}

src/main/resources/application.yml

@@ -54,8 +54,7 @@ spring:
 
   sql:
     init:
-      mode: always
-      schema-locations: classpath:org/springframework/ai/chat/memory/repository/jdbc/schema-h2.sql
+      mode: never  # prod에서는 Hibernate가 스키마 관리
 
   # WebSocket 설정 (Guest-Guide 채팅용)
   websocket: