AI Service 초기 설정 및 패키지 구조 생성

- application.yml 설정 업데이트
  - Redis Database: 4번으로 변경 (서비스별 분리)
  - Server Port: 8084로 변경
  - Azure OpenAI 설정 추가 (gpt-4o, text-embedding-3-large)
  - Azure AI Search 설정 추가
  - Azure Event Hubs 설정 추가
  - JWT 토큰 유효기간 표준화 (1800s/86400s)

- Clean Architecture 패키지 구조 생성
  - biz/domain: 도메인 모델
  - biz/dto: 비즈니스 DTO
  - biz/usecase: 유스케이스 (in/out 포트)
  - biz/service: 유스케이스 구현체
  - infra/controller: REST API 컨트롤러
  - infra/gateway: 출력 포트 구현체
  - infra/config: 설정 클래스

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

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

ai/src/main/resources/application.yml

@@ -39,35 +39,49 @@ spring:
           max-idle: 8
           min-idle: 0
           max-wait: -1ms
-      database: ${REDIS_DATABASE:3}
+      database: ${REDIS_DATABASE:4}
 
 # Server Configuration
 server:
-  port: ${SERVER_PORT:8083}
+  port: ${SERVER_PORT:8084}
+  servlet:
+    context-path: ${CONTEXT_PATH:}
 
 # JWT Configuration
 jwt:
   secret: ${JWT_SECRET:}
-  access-token-validity: ${JWT_ACCESS_TOKEN_VALIDITY:3600}
-  refresh-token-validity: ${JWT_REFRESH_TOKEN_VALIDITY:604800}
+  access-token-validity: ${JWT_ACCESS_TOKEN_VALIDITY:1800}
+  refresh-token-validity: ${JWT_REFRESH_TOKEN_VALIDITY:86400}
 
 # CORS Configuration
 cors:
   allowed-origins: ${CORS_ALLOWED_ORIGINS:http://localhost:*}
 
-# OpenAI Configuration
+# Azure OpenAI Configuration
+azure:
   openai:
-  api-key: ${OPENAI_API_KEY:}
-  model: ${OPENAI_MODEL:gpt-4}
-  max-tokens: ${OPENAI_MAX_TOKENS:2000}
-  temperature: ${OPENAI_TEMPERATURE:0.7}
+    api-key: ${AZURE_OPENAI_API_KEY:}
+    endpoint: ${AZURE_OPENAI_ENDPOINT:}
+    deployment-name: ${AZURE_OPENAI_DEPLOYMENT:gpt-4o}
+    embedding-deployment: ${AZURE_OPENAI_EMBEDDING_DEPLOYMENT:text-embedding-3-large}
+    max-tokens: ${AZURE_OPENAI_MAX_TOKENS:2000}
+    temperature: ${AZURE_OPENAI_TEMPERATURE:0.3}
 
   # Azure AI Search Configuration
-azure:
-  aisearch:
-    endpoint: ${AZURE_AISEARCH_ENDPOINT:}
-    api-key: ${AZURE_AISEARCH_API_KEY:}
-    index-name: ${AZURE_AISEARCH_INDEX_NAME:minutes-index}
+  ai-search:
+    endpoint: ${AZURE_AI_SEARCH_ENDPOINT:}
+    api-key: ${AZURE_AI_SEARCH_API_KEY:}
+    index-name: ${AZURE_AI_SEARCH_INDEX:meeting-transcripts}
+
+  # Azure Event Hubs Configuration
+  eventhub:
+    connection-string: ${AZURE_EVENTHUB_CONNECTION_STRING:}
+    namespace: ${AZURE_EVENTHUB_NAMESPACE:hgzero-eventhub-ns}
+    checkpoint-storage-connection-string: ${AZURE_CHECKPOINT_STORAGE_CONNECTION_STRING:}
+    checkpoint-container: ${AZURE_CHECKPOINT_CONTAINER:hgzero-checkpoints}
+    consumer-group:
+      transcript: ${AZURE_EVENTHUB_CONSUMER_GROUP_TRANSCRIPT:ai-transcript-group}
+      meeting: ${AZURE_EVENTHUB_CONSUMER_GROUP_MEETING:ai-meeting-group}
 
 # Actuator Configuration
 management: