feat: AI虚拟用户新闻互动系统 v1.3.0 初始提交

- 虚拟用户管理（昵称/头像/性别/简介/邮箱同步到目标平台）
- AI互动调度（点赞/收藏/评论/转发）
- 日志时间改为北京时间
- 评论达上限后继续执行点赞收藏转发
- 一键登出全部功能
- 浅色主题UI

backend/app/core/config.py

@@ -0,0 +1,46 @@
+"""系统配置"""
+import os
+from urllib.parse import quote_plus
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    # 数据库
+    DB_HOST: str = os.getenv("DB_HOST", "localhost")
+    DB_PORT: int = int(os.getenv("DB_PORT", "3306"))
+    DB_USER: str = os.getenv("DB_USER", "aivirtual")
+    DB_PASSWORD: str = os.getenv("DB_PASSWORD", "AiVirtual2024")
+    DB_NAME: str = os.getenv("DB_NAME", "ai_virtual_news")
+
+    # Redis
+    REDIS_HOST: str = os.getenv("REDIS_HOST", "localhost")
+    REDIS_PORT: int = int(os.getenv("REDIS_PORT", "6379"))
+
+    # 安全
+    SECRET_KEY: str = os.getenv("SECRET_KEY", "dev-secret-key-change-in-prod")
+    AES_KEY: str = os.getenv("AES_KEY", "your-aes-key-32-chars-change-now!")
+
+    # 新闻平台
+    NEWS_PLATFORM_BASE_URL: str = os.getenv(
+        "NEWS_PLATFORM_BASE_URL", "http://192.168.1.200:63120"
+    )
+
+    # 日志目录
+    LOG_DIR: str = "/app/logs"
+
+    @property
+    def DATABASE_URL(self) -> str:
+        # 对密码做 URL 编码，防止 @ # ! 等特殊字符破坏连接字符串
+        pwd = quote_plus(self.DB_PASSWORD)
+        return f"mysql+aiomysql://{self.DB_USER}:{pwd}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}?charset=utf8mb4"
+
+    @property
+    def SYNC_DATABASE_URL(self) -> str:
+        pwd = quote_plus(self.DB_PASSWORD)
+        return f"mysql+pymysql://{self.DB_USER}:{pwd}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}?charset=utf8mb4"
+
+    class Config:
+        env_file = ".env"
+
+
+settings = Settings()