feat(deploy): Complete PostgreSQL migration and Docker image build

Summary:
- PostgreSQL database migration to RDS completed (90MB SQL, 11 schemas)
- Frontend Nginx Docker image built and pushed to ACR (v1.0, ~50MB)
- Python microservice Docker image built and pushed to ACR (v1.0, 1.12GB)
- Created 3 deployment documentation files

Docker Configuration Files:
- frontend-v2/Dockerfile: Multi-stage build with nginx:alpine
- frontend-v2/.dockerignore: Optimize build context
- frontend-v2/nginx.conf: SPA routing and API proxy
- frontend-v2/docker-entrypoint.sh: Dynamic env injection
- extraction_service/Dockerfile: Multi-stage build with Aliyun Debian mirror
- extraction_service/.dockerignore: Optimize build context
- extraction_service/requirements-prod.txt: Production dependencies (removed Nougat)

Deployment Documentation:
- docs/05-部署文档/00-部署进度总览.md: One-stop deployment status overview
- docs/05-部署文档/07-前端Nginx-SAE部署操作手册.md: Frontend deployment guide
- docs/05-部署文档/08-PostgreSQL数据库部署操作手册.md: Database deployment guide
- docs/00-系统总体设计/00-系统当前状态与开发指南.md: Updated with deployment status

Database Migration:
- RDS instance: pgm-2zex1m2y3r23hdn5 (2C4G, PostgreSQL 15.0)
- Database: ai_clinical_research
- Schemas: 11 business schemas migrated successfully
- Data: 3 users, 2 projects, 1204 literatures verified
- Backup: rds_init_20251224_154529.sql (90MB)

Docker Images:
- Frontend: crpi-cd5ij4pjt65mweeo.cn-beijing.personal.cr.aliyuncs.com/ai-clinical/ai-clinical_frontend-nginx:v1.0
- Python: crpi-cd5ij4pjt65mweeo.cn-beijing.personal.cr.aliyuncs.com/ai-clinical/python-extraction:v1.0

Key Achievements:
- Resolved Docker Hub network issues (using generic tags)
- Fixed 30 TypeScript compilation errors
- Removed Nougat OCR to reduce image size by 1.5GB
- Used Aliyun Debian mirror to resolve apt-get network issues
- Implemented multi-stage builds for optimization

Next Steps:
- Deploy Python microservice to SAE
- Build Node.js backend Docker image
- Deploy Node.js backend to SAE
- Deploy frontend Nginx to SAE
- End-to-end verification testing

Status: Docker images ready, SAE deployment pending

frontend-v2/docker-entrypoint.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+set -e
+
+# ⚠️ 关键：不给默认值，强制在 SAE 控制台配置
+# 如果未配置，报错退出（避免使用错误的后端地址）
+if [ -z "$BACKEND_SERVICE_HOST" ]; then
+  echo "❌ ERROR: BACKEND_SERVICE_HOST environment variable is required!"
+  echo "Please configure it in SAE console with backend internal IP (e.g., 172.17.x.x)"
+  exit 1
+fi
+
+if [ -z "$BACKEND_SERVICE_PORT" ]; then
+  echo "⚠️  WARNING: BACKEND_SERVICE_PORT not set, using default: 3001"
+  export BACKEND_SERVICE_PORT=3001
+fi
+
+echo "============================================"
+echo "Starting Frontend Nginx Service"
+echo "Backend Service: ${BACKEND_SERVICE_HOST}:${BACKEND_SERVICE_PORT}"
+echo "Container Timezone: $(cat /etc/timezone)"
+echo "Current Time: $(date)"
+echo "============================================"
+
+# 使用 envsubst 替换 Nginx 配置中的环境变量
+envsubst '${BACKEND_SERVICE_HOST} ${BACKEND_SERVICE_PORT}' \
+  < /etc/nginx/templates/nginx.conf.template \
+  > /etc/nginx/nginx.conf
+
+# 验证 Nginx 配置
+nginx -t
+
+# 启动 Nginx
+exec nginx -g 'daemon off;'
+
+