feat(engine): 新增 Python 策略引擎模块

- config/settings.py：Pydantic 解析 env.yaml
- data/db.py：asyncpg 连接池管理
- data/reader.py：KlineReader 只读查询 TimescaleDB
- data/models.py：KlineRecord 等 Pydantic 模型，镜像 TypeORM 实体
- example/test_db.py：数据库查询验证示例
- README.md：引擎架构文档

engine/config/settings.py

@@ -0,0 +1,81 @@
+"""中心化配置模块 —— 读取项目根目录 env.yaml，Pydantic 校验导出强类型配置对象。"""
+
+from pathlib import Path
+from typing import Literal
+
+import yaml
+from pydantic import BaseModel, Field
+
+
+class DbConfig(BaseModel):
+    """TimescaleDB / PostgreSQL 连接参数"""
+
+    host: str = "localhost"
+    port: int = Field(default=5432, ge=1, le=65535)
+    name: str
+    user: str
+    password: str
+
+
+class RedisConfig(BaseModel):
+    """Redis 连接配置"""
+
+    url: str = "redis://localhost:6379"
+    publish_enabled: bool = True
+
+
+class LoggingConfig(BaseModel):
+    """日志配置"""
+
+    level: Literal["trace", "debug", "info", "warn", "error", "fatal"] = "info"
+    node_env: Literal["development", "production"] = "development"
+
+
+class EnvConfig(BaseModel):
+    """env.yaml 顶层结构"""
+
+    db: DbConfig
+    redis: RedisConfig
+    logging: LoggingConfig
+
+
+def _get_project_root() -> Path:
+    return Path(__file__).resolve().parent.parent.parent
+
+
+def _load_yaml_config() -> dict:
+    root = _get_project_root()
+    yaml_path = root / "env.yaml"
+
+    if not yaml_path.exists():
+        raise FileNotFoundError(
+            f"[config] 无法读取配置文件: {yaml_path}\n"
+            f"请确保项目根目录存在 env.yaml。"
+        )
+
+    with open(yaml_path, "r", encoding="utf-8") as f:
+        data = yaml.safe_load(f)
+
+    if data is None:
+        raise ValueError(f"[config] env.yaml 解析结果为空: {yaml_path}")
+
+    return data
+
+
+_raw = _load_yaml_config()
+_config = EnvConfig.model_validate(_raw)
+
+db = _config.db
+redis = _config.redis
+logging = _config.logging
+
+DB_DSN = f"postgresql://{db.user}:{db.password}@{db.host}:{db.port}/{db.name}"
+
+
+def print_config_summary() -> None:
+    """打印脱敏后的配置概要（不含密码明文）"""
+    print(f"[config] TimescaleDB: {db.user}@{db.host}:{db.port}/{db.name}")
+    print(
+        f"[config] Redis: {redis.url.replace('//', '//***@') if '@' in redis.url else redis.url}"
+    )
+    print(f"[config] Logging: level={logging.level}, env={logging.node_env}")