Initial commit: hulai admin API backend

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.example

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+DATABASE_URL=mysql+pymysql://root:password@localhost:3306/hulai_admin?charset=utf8mb4
+JWT_SECRET_KEY=change-this-to-a-random-secret-key
+JWT_ALGORITHM=HS256
+JWT_EXPIRE_MINUTES=480
+NUXT_DATA_PATH=/path/to/hulai-website/data
+NUXT_PROJECT_PATH=/path/to/hulai-website
+UPLOAD_DIR=/path/to/hulai-website/public/images