Initial commit: Happy Up monorepo through Sprint 5.

Document-driven MVP with FastAPI backend, Vue H5, WeChat mini shell, product demo, and Docker dev stack.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/.env.example

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+APP_NAME=Kids AI Posture Platform API
+APP_ENV=development
+APP_DEBUG=true
+DATABASE_URL=mysql+pymysql://happy_up:happy_up@127.0.0.1:3306/happy_up?charset=utf8mb4
+REDIS_URL=redis://127.0.0.1:6379/0
+JWT_SECRET=change-me-in-production-use-32-char-min
+JWT_EXPIRE_MINUTES=10080
+DEMO_SMS_CODE=682139
+ANALYSIS_INLINE_PROCESS=true
+WEBHOOK_SECRET=dev-webhook-secret-change-me
+CORS_ORIGINS=http://localhost:5173,http://127.0.0.1:5173,http://127.0.0.1:5500,null
+API_PUBLIC_URL=http://127.0.0.1:8000
+UPLOAD_LOCAL_DIR=data/uploads
+OSS_ENABLED=false
+OSS_PROVIDER=minio
+OSS_ENDPOINT=http://127.0.0.1:9000
+OSS_ACCESS_KEY=minioadmin
+OSS_SECRET_KEY=minioadmin
+OSS_BUCKET=happy-up-videos
+OSS_REGION=us-east-1
+OSS_CDN_BASE_URL=
+
+# 生产阿里云示例（OSS_ENABLED=true 时生效）
+# OSS_PROVIDER=aliyun
+# OSS_ENDPOINT=https://oss-cn-hangzhou.aliyuncs.com
+# OSS_REGION=cn-hangzhou
+# OSS_CDN_BASE_URL=https://cdn.your-domain.com