Initial MVP for QA asset backend

hy_qa_asset_backend/backend/app/config.py

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+from functools import lru_cache
+from pathlib import Path
+
+from pydantic import Field
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    app_name: str = "大本营答疑资产后台系统 MVP"
+    database_url: str | None = Field(default=None, alias="DATABASE_URL")
+    openai_api_key: str | None = Field(default=None, alias="OPENAI_API_KEY")
+    openai_base_url: str | None = Field(default=None, alias="OPENAI_BASE_URL")
+    model_name: str = Field(default="gpt-4.1-mini", alias="MODEL_NAME")
+
+    feishu_app_id: str | None = Field(default=None, alias="FEISHU_APP_ID")
+    feishu_app_secret: str | None = Field(default=None, alias="FEISHU_APP_SECRET")
+    feishu_app_token: str | None = Field(default=None, alias="FEISHU_APP_TOKEN")
+    feishu_wiki_node_token: str | None = Field(default=None, alias="FEISHU_WIKI_NODE_TOKEN")
+    feishu_table_id_session: str | None = Field(default=None, alias="FEISHU_TABLE_ID_SESSION")
+    feishu_table_id_raw_qa: str | None = Field(default=None, alias="FEISHU_TABLE_ID_RAW_QA")
+    feishu_table_id_standard_qa: str | None = Field(default=None, alias="FEISHU_TABLE_ID_STANDARD_QA")
+
+    schedule_cron: str = Field(default="0 1 * * *", alias="SCHEDULE_CRON")
+    schedule_timezone: str = Field(default="Asia/Shanghai", alias="SCHEDULE_TIMEZONE")
+    mock_mode: bool = Field(default=True, alias="MOCK_MODE")
+
+    model_config = SettingsConfigDict(
+        env_file=(".env", "../.env", "../../.env"),
+        env_file_encoding="utf-8",
+        extra="ignore",
+        populate_by_name=True,
+    )
+
+    @property
+    def resolved_database_url(self) -> str:
+        if self.database_url:
+            return self.database_url
+        db_path = Path(__file__).resolve().parents[2] / "hy_qa_asset.db"
+        return f"sqlite:///{db_path.as_posix()}"
+
+    @property
+    def openai_configured(self) -> bool:
+        return bool(self.openai_api_key)
+
+    @property
+    def feishu_configured(self) -> bool:
+        return all(
+            [
+                self.feishu_app_id,
+                self.feishu_app_secret,
+                self.feishu_app_token or self.feishu_wiki_node_token,
+                self.feishu_table_id_session,
+                self.feishu_table_id_raw_qa,
+                self.feishu_table_id_standard_qa,
+            ]
+        )
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()