feat: AI 서비스 AKS 배포 준비 및 API 경로 수정

## API 경로 변경
- /api/v1/ai → /api/ai 로 경로 단순화
- 최종 엔드포인트: /api/ai/suggestions/meetings/{meetingId}/stream

## Docker 컨테이너화
- Dockerfile 작성 (Python 3.11 slim 기반)
- .dockerignore 추가
- 헬스 체크 포함

## Kubernetes 배포
- Deployment 및 Service 매니페스트 작성
- Replica: 1, Port: 8087
- Liveness/Readiness Probe 설정
- 리소스 제한: CPU 250m-1000m, Memory 512Mi-1024Mi

## Secret 및 ConfigMap
- ai-secret: Claude API Key
- azure-secret: Event Hub Connection String (AI Listen Policy)
- redis-config/redis-secret: Redis 연결 정보

## Ingress 설정
- /api/ai/suggestions 경로 추가 (ai-service:8087)
- 기존 /api/ai 경로 유지 (ai:8080)

## 배포 문서
- DEPLOYMENT.md: 상세한 AKS 배포 가이드
  - Docker 이미지 빌드 및 푸시
  - Secret/ConfigMap 생성
  - 배포 및 검증
  - 트러블슈팅

## ACR 이미지
- acrdigitalgarage02.azurecr.io/hgzero/ai-service:latest

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

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

deploy/k8s/backend/ai-secret-template.yaml

@@ -0,0 +1,27 @@
+---
+# AI Service Secret Template
+# 실제 배포 시 base64로 인코딩된 값으로 교체 필요
+apiVersion: v1
+kind: Secret
+metadata:
+  name: ai-secret
+  namespace: hgzero
+type: Opaque
+data:
+  # Claude API Key (base64 인코딩 필요)
+  # echo -n "sk-ant-api03-..." | base64
+  claude-api-key: <BASE64_ENCODED_CLAUDE_API_KEY>
+
+---
+# Azure EventHub Secret for AI Service
+# AI 서비스용 Event Hub 연결 문자열
+apiVersion: v1
+kind: Secret
+metadata:
+  name: azure-secret
+  namespace: hgzero
+type: Opaque
+data:
+  # Event Hub Connection String (AI Listen Policy)
+  # echo -n "Endpoint=sb://..." | base64
+  eventhub-ai-connection-string: <BASE64_ENCODED_EVENTHUB_CONNECTION_STRING>

deploy/k8s/backend/ai-service.yaml

@@ -0,0 +1,130 @@
+---
+# AI Service (Python) Deployment
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: ai-service
+  namespace: hgzero
+  labels:
+    app: ai-service
+    tier: backend
+    language: python
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: ai-service
+  template:
+    metadata:
+      labels:
+        app: ai-service
+        tier: backend
+        language: python
+    spec:
+      containers:
+      - name: ai-service
+        image: acrdigitalgarage02.azurecr.io/hgzero/ai-service:latest
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 8087
+          name: http
+        env:
+        # 서버 설정
+        - name: PORT
+          value: "8087"
+        - name: HOST
+          value: "0.0.0.0"
+        - name: LOG_LEVEL
+          value: "INFO"
+
+        # Claude API
+        - name: CLAUDE_API_KEY
+          valueFrom:
+            secretKeyRef:
+              name: ai-secret
+              key: claude-api-key
+        - name: CLAUDE_MODEL
+          value: "claude-3-5-sonnet-20241022"
+        - name: CLAUDE_MAX_TOKENS
+          value: "2000"
+        - name: CLAUDE_TEMPERATURE
+          value: "0.3"
+
+        # Redis
+        - name: REDIS_HOST
+          valueFrom:
+            configMapKeyRef:
+              name: redis-config
+              key: host
+        - name: REDIS_PORT
+          valueFrom:
+            configMapKeyRef:
+              name: redis-config
+              key: port
+        - name: REDIS_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: redis-secret
+              key: password
+        - name: REDIS_DB
+          value: "4"
+
+        # Azure Event Hub
+        - name: EVENTHUB_CONNECTION_STRING
+          valueFrom:
+            secretKeyRef:
+              name: azure-secret
+              key: eventhub-ai-connection-string
+        - name: EVENTHUB_NAME
+          value: "hgzero-eventhub-name"
+        - name: EVENTHUB_CONSUMER_GROUP
+          value: "$Default"
+
+        # CORS
+        - name: CORS_ORIGINS
+          value: '["*"]'
+
+        resources:
+          requests:
+            cpu: 250m
+            memory: 512Mi
+          limits:
+            cpu: 1000m
+            memory: 1024Mi
+
+        livenessProbe:
+          httpGet:
+            path: /health
+            port: 8087
+          initialDelaySeconds: 30
+          periodSeconds: 10
+          timeoutSeconds: 5
+          failureThreshold: 3
+
+        readinessProbe:
+          httpGet:
+            path: /health
+            port: 8087
+          initialDelaySeconds: 10
+          periodSeconds: 5
+          timeoutSeconds: 3
+          failureThreshold: 3
+
+---
+# AI Service Service
+apiVersion: v1
+kind: Service
+metadata:
+  name: ai-service
+  namespace: hgzero
+  labels:
+    app: ai-service
+spec:
+  type: ClusterIP
+  ports:
+  - port: 8087
+    targetPort: 8087
+    protocol: TCP
+    name: http
+  selector:
+    app: ai-service