feat: enhance Jenkins pipeline with Discord notifications and model hot-reload functionality

- Added a new stage to the Jenkins pipeline to notify Discord when a build starts, succeeds, or fails, improving communication during the CI/CD process.
- Implemented model hot-reload functionality in the MLFilter class, allowing automatic reloading of models when file changes are detected, enhancing responsiveness to updates.
- Updated deployment scripts to provide clearer messaging regarding model loading and container status, improving user experience and debugging capabilities.

Jenkinsfile

@@ -7,9 +7,24 @@ pipeline {
         IMAGE_TAG     = "${env.BUILD_NUMBER}"
         FULL_IMAGE    = "${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG}"
         LATEST_IMAGE  = "${REGISTRY}/${IMAGE_NAME}:latest"
+        
+        // 젠킨스 자격 증명에 저장해둔 디스코드 웹훅 주소를 불러옵니다.
+        DISCORD_WEBHOOK = credentials('discord-webhook')
     }
 
     stages {
+        // 빌드가 시작되자마자 알림을 보냅니다.
+        stage('Notify Build Start') {
+            steps {
+                sh """
+                curl -H "Content-Type: application/json" \
+                     -X POST \
+                     -d '{"content": "🚀 **[빌드 시작]** `cointrader` (Build #${env.BUILD_NUMBER}) 배포 파이프라인 가동"}' \
+                     ${DISCORD_WEBHOOK}
+                """
+            }
+        }
+
         stage('Git Clone from Gitea') {
             steps {
                 git branch: 'main',
@@ -55,12 +70,25 @@ pipeline {
         }
     }
 
+    // 파이프라인 결과에 따른 디스코드 알림
     post {
         success {
             echo "Build #${env.BUILD_NUMBER} 성공: ${FULL_IMAGE} → 운영 LXC(10.1.10.24) 배포 완료"
+            sh """
+            curl -H "Content-Type: application/json" \
+                 -X POST \
+                 -d '{"content": "✅ **[배포 성공]** `cointrader` (Build #${env.BUILD_NUMBER}) 운영 서버(10.1.10.24) 배포 완료!\\n- 📦 이미지: `${FULL_IMAGE}`"}' \
+                 ${DISCORD_WEBHOOK}
+            """
         }
         failure {
             echo "Build #${env.BUILD_NUMBER} 실패"
+            sh """
+            curl -H "Content-Type: application/json" \
+                 -X POST \
+                 -d '{"content": "❌ **[배포 실패]** `cointrader` (Build #${env.BUILD_NUMBER}) 파이프라인 에러 발생. 젠킨스 로그를 확인해 주세요!"}' \
+                 ${DISCORD_WEBHOOK}
+            """
         }
     }
-}
+}