fix(be): Fix WebSocket chat connection and reduce production logs (#issue)

- Change AI Tool logs from INFO to DEBUG to reduce production log volume
  - WeatherTool: All log.info() -> log.debug()
  - TourTool: All log.info() -> log.debug()
  - GuideFinderTool: All log.info() -> log.debug()

- Fix AuthController NullPointerException for unauthenticated users
  - Make authentication parameter nullable in updateUserRole()
  - Add proper null check with error message

- Fix WebSocket chat message publishing in production
  - Change RabbitChatMessagePublisher to use SimpMessagingTemplate
  - Replace AMQP direct publishing with STOMP Broker Relay
  - Fixes 'chat.reconnecting' issue where messages weren't delivered to STOMP subscribers

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

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

Author: JIWONKIMS

src/main/kotlin/com/back/koreaTravelGuide/domain/ai/aiChat/tool/GuideFinderTool.kt

@@ -23,17 +23,17 @@ class GuideFinderTool(
         )
         region: String,
     ): String {
-        log.info("🔧 [TOOL CALLED] findGuidesByRegion - region: $region")
+        log.debug("🔧 [TOOL CALLED] findGuidesByRegion - region: $region")
 
         val guides = guideService.findGuidesByRegion(region)
 
         return try {
             if (guides.isEmpty()) {
-                log.info("✅ [TOOL RESULT] findGuidesByRegion - 결과 없음")
+                log.debug("✅ [TOOL RESULT] findGuidesByRegion - 결과 없음")
                 return "해당 지역에서 활동하는 가이드를 찾을 수 없습니다."
             }
             val result = objectMapper.writeValueAsString(guides)
-            log.info("✅ [TOOL RESULT] findGuidesByRegion - 결과: ${result.take(200)}...")
+            log.debug("✅ [TOOL RESULT] findGuidesByRegion - 결과: ${result.take(200)}...")
             result
         } catch (e: Exception) {
             log.error("❌ [TOOL ERROR] findGuidesByRegion - 예외 발생: ${e.javaClass.name}", e)

src/main/kotlin/com/back/koreaTravelGuide/domain/ai/aiChat/tool/TourTool.kt

@@ -49,7 +49,7 @@ class TourTool(
         )
         areaAndSigunguCode: String,
     ): String {
-        log.info(
+        log.debug(
             "🔧 [TOOL CALLED] getAreaBasedTourInfo - " +
                 "contentTypeId: $contentTypeId, areaAndSigunguCode: $areaAndSigunguCode, languageCode: $languageCode",
         )
@@ -59,7 +59,7 @@ class TourTool(
 
         return try {
             val result = tourInfo.let { objectMapper.writeValueAsString(it) }
-            log.info("✅ [TOOL RESULT] getAreaBasedTourInfo - 결과: ${result.take(100)}...")
+            log.debug("✅ [TOOL RESULT] getAreaBasedTourInfo - 결과: ${result.take(100)}...")
             result
         } catch (e: Exception) {
             log.error("❌ [TOOL ERROR] getAreaBasedTourInfo - 예외 발생", e)
@@ -110,7 +110,7 @@ class TourTool(
         @ToolParam(description = "검색 반경(미터 단위)", required = true)
         radius: String = "100",
     ): String {
-        log.info(
+        log.debug(
             "🔧 [TOOL CALLED] getLocationBasedTourInfo - " +
                 "contentTypeId: $contentTypeId, area: $areaAndSigunguCode, " +
                 "mapX: $mapX, mapY: $mapY, radius: $radius, languageCode: $languageCode",
@@ -122,7 +122,7 @@ class TourTool(
 
         return try {
             val result = tourLocationBasedInfo.let { objectMapper.writeValueAsString(it) }
-            log.info("✅ [TOOL RESULT] getLocationBasedTourInfo - 결과: ${result.take(100)}...")
+            log.debug("✅ [TOOL RESULT] getLocationBasedTourInfo - 결과: ${result.take(100)}...")
             result
         } catch (e: Exception) {
             log.error("❌ [TOOL ERROR] getLocationBasedTourInfo - 예외 발생", e)
@@ -153,14 +153,14 @@ class TourTool(
         )
         contentId: String,
     ): String {
-        log.info("🔧 [TOOL CALLED] getTourDetailInfo - contentId: $contentId, languageCode: $languageCode")
+        log.debug("🔧 [TOOL CALLED] getTourDetailInfo - contentId: $contentId, languageCode: $languageCode")
 
         val tourDetailParams = TourDetailParams(contentId)
         val tourDetailInfo = tourService.fetchTourDetail(tourDetailParams, languageCode)
 
         return try {
             val result = tourDetailInfo.let { objectMapper.writeValueAsString(it) }
-            log.info("✅ [TOOL RESULT] getTourDetailInfo - 결과: ${result.take(100)}...")
+            log.debug("✅ [TOOL RESULT] getTourDetailInfo - 결과: ${result.take(100)}...")
             result
         } catch (e: Exception) {
             log.error("❌ [TOOL ERROR] getTourDetailInfo - 예외 발생", e)

src/main/kotlin/com/back/koreaTravelGuide/domain/ai/aiChat/tool/WeatherTool.kt

@@ -15,16 +15,16 @@ class WeatherTool(
 ) {
     @Tool(description = "전국 중기예보를 조회합니다")
     fun getWeatherForecast(): String {
-        log.info("🔧 [TOOL CALLED] getWeatherForecast")
+        log.debug("🔧 [TOOL CALLED] getWeatherForecast")
 
         val forecasts = weatherService.getWeatherForecast()
-        log.info("📦 [DATA] forecasts is null? ${forecasts == null}")
-        log.info("📦 [DATA] forecasts 타입: ${forecasts?.javaClass?.name}")
-        log.info("📦 [DATA] forecasts 내용: $forecasts")
+        log.debug("📦 [DATA] forecasts is null? ${forecasts == null}")
+        log.debug("📦 [DATA] forecasts 타입: ${forecasts?.javaClass?.name}")
+        log.debug("📦 [DATA] forecasts 내용: $forecasts")
 
         return try {
             val result = forecasts?.let { objectMapper.writeValueAsString(it) } ?: "중기예보 데이터를 가져올 수 없습니다."
-            log.info("✅ [TOOL RESULT] getWeatherForecast - 결과: $result")
+            log.debug("✅ [TOOL RESULT] getWeatherForecast - 결과: $result")
             result
         } catch (e: Exception) {
             log.error("❌ [TOOL ERROR] getWeatherForecast - 예외 발생: ${e.javaClass.name}", e)
@@ -41,13 +41,13 @@ class WeatherTool(
         )
         location: String,
     ): String {
-        log.info("🔧 [TOOL CALLED] getRegionalWeatherDetails - location: $location")
+        log.debug("🔧 [TOOL CALLED] getRegionalWeatherDetails - location: $location")
 
         val forecasts = weatherService.getTemperatureAndLandForecast(location)
 
         return try {
             val result = forecasts?.let { objectMapper.writeValueAsString(it) } ?: "$location 지역의 상세 날씨 정보를 가져올 수 없습니다."
-            log.info("✅ [TOOL RESULT] getRegionalWeatherDetails - 결과: $result")
+            log.debug("✅ [TOOL RESULT] getRegionalWeatherDetails - 결과: $result")
             result
         } catch (e: Exception) {
             log.error("❌ [TOOL ERROR] getRegionalWeatherDetails - 예외 발생: ${e.javaClass.name}", e)

src/main/kotlin/com/back/koreaTravelGuide/domain/auth/controller/AuthController.kt

@@ -46,11 +46,11 @@ class AuthController(
     @Operation(summary = "신규 사용자 역할 선택")
     @PostMapping("/role")
     fun updateUserRole(
-        authentication: Authentication,
+        authentication: Authentication?,
         @RequestBody request: UserRoleUpdateRequest,
         response: HttpServletResponse,
     ): ResponseEntity<ApiResponse<AccessTokenResponse>> {
-        val userId = authentication.getUserId()
+        val userId = authentication?.getUserId() ?: throw IllegalArgumentException("인증되지 않은 사용자입니다.")
         val (accessToken, refreshToken) = authService.updateRoleAndLogin(userId, request.role)
 
         val cookie =

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatmessage/usecase/RabbitChatMessagePublisher.kt

@@ -1,19 +1,20 @@
 package com.back.koreaTravelGuide.domain.userChat.chatmessage.usecase
 
-import org.springframework.amqp.rabbit.core.RabbitTemplate
 import org.springframework.context.annotation.Profile
+import org.springframework.messaging.simp.SimpMessagingTemplate
 import org.springframework.stereotype.Component
 
 @Profile("prod")
 @Component
 class RabbitChatMessagePublisher(
-    private val rabbitTemplate: RabbitTemplate,
+    private val messagingTemplate: SimpMessagingTemplate,
 ) : ChatMessagePublisher {
     override fun publishUserChat(
         roomId: Long,
         payload: Any,
     ) {
-        val routingKey = "userchat.$roomId"
-        rabbitTemplate.convertAndSend("amq.topic", routingKey, payload)
+        // STOMP Broker Relay를 통해 RabbitMQ로 메시지 발행
+        // enableStompBrokerRelay("/topic") 설정에 의해 자동으로 RabbitMQ STOMP Broker로 라우팅됨
+        messagingTemplate.convertAndSend("/topic/userchat/$roomId", payload)
     }
 }