chore: 重构前基线 — 9 个 sync task 全部 ok + akshare 移除 + mairui 资金流接入

状态：
- 9 个 sync task（stock_basic / kline_daily / kline_index / kline_5min /
  moneyflow / industry_sector / sector_features / share_snapshot / market_regime）
- 数据源：baostock + mairui + 雪球(pysnowball) + 新浪（4 个）
- 项目级约束：永远不用 akshare（已落实）
- kline_5min 改用 DB 快照统一全量/增量逻辑
- 零后端 Chrome 扩展 xueqiu_sync（独立项目）

app/core/config.py

@@ -0,0 +1,126 @@
+"""统一配置：从 .env / 环境变量读 MySQL、调度器、数据源开关等参数。"""
+from __future__ import annotations
+
+import os
+from pathlib import Path
+from typing import Optional
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+try:
+    from dotenv import load_dotenv
+    _HAS_DOTENV = True
+except ImportError:
+    _HAS_DOTENV = False
+
+
+_PROJECT_ROOT = Path(__file__).resolve().parent.parent.parent
+
+# 启动时自动把 .env 加载到 os.environ，使下游 `os.environ.get(...)` 代码
+# （如 app/sources/mairui.py / xueqiu.py）能拿到 credentials。
+if _HAS_DOTENV:
+    _env_file = _PROJECT_ROOT / ".env"
+    if _env_file.exists():
+        load_dotenv(_env_file, override=False)
+
+
+class Settings(BaseSettings):
+    """应用配置。所有字段都可以通过环境变量或 .env 文件覆盖。"""
+
+    # MySQL
+    mysql_host: str = "127.0.0.1"
+    mysql_port: int = 3306
+    mysql_user: str = "root"
+    mysql_password: str = ""
+    # 同步任务写入的目标库（原始市场数据）
+    mysql_database: str = "market_data_sync_db"
+    # 简版库（对照测试，可选）
+    mysql_database_lite: str = "grid_seeker"
+    # 业务主库（保留— 同步任务不再写入）
+    mysql_database_business: str = "grid_seeker_model_base"
+
+    # Scheduler
+    scheduler_tick_seconds: int = 5
+    scheduler_timezone: str = "Asia/Shanghai"
+    scheduler_auto_seed: bool = True
+
+    # API
+    api_host: str = "0.0.0.0"
+    api_port: int = 8100
+
+    # Logging
+    log_level: str = "INFO"
+    log_dir: str = "./logs"
+
+    # Datasources
+    ds_baostock_enabled: bool = True
+    ds_sina_enabled: bool = True
+    xueqiu_token: str = ""
+
+    # Trading calendar
+    trading_holidays: str = ""
+
+    model_config = SettingsConfigDict(
+        env_file=str(_PROJECT_ROOT / ".env"),
+        env_file_encoding="utf-8",
+        case_sensitive=False,
+        extra="ignore",
+    )
+
+    @property
+    def project_root(self) -> Path:
+        return _PROJECT_ROOT
+
+    @property
+    def log_path(self) -> Path:
+        p = Path(self.log_dir)
+        if not p.is_absolute():
+            p = _PROJECT_ROOT / p
+        p.mkdir(parents=True, exist_ok=True)
+        return p
+
+    @property
+    def holidays_list(self) -> list[str]:
+        if not self.trading_holidays:
+            return []
+        return [d.strip() for d in self.trading_holidays.split(",") if d.strip()]
+
+    def mysql_url(self, database: Optional[str] = None) -> str:
+        """构造 SQLAlchemy URL。"""
+        db = database or self.mysql_database
+        return (
+            f"mysql+pymysql://{self.mysql_user}:{self.mysql_password}"
+            f"@{self.mysql_host}:{self.mysql_port}/{db}?charset=utf8mb4"
+        )
+
+    def pymysql_connect_kwargs(self, database: Optional[str] = None) -> dict:
+        """构造 pymysql.connect 的关键字参数。
+
+        内网自签名证书场景自动禁用 SSL。
+        """
+        db = database or self.mysql_database
+        return {
+            "host": self.mysql_host,
+            "port": self.mysql_port,
+            "user": self.mysql_user,
+            "password": self.mysql_password,
+            "database": db,
+            "charset": "utf8mb4",
+            "autocommit": False,
+            # 兼容自签名证书的内网 MySQL — 禁用 SSL
+            "ssl": None,
+        }
+
+
+_settings: Optional[Settings] = None
+
+
+def get_settings() -> Settings:
+    """全局单例。"""
+    global _settings
+    if _settings is None:
+        _settings = Settings()
+    return _settings
+
+
+settings = get_settings()