第一次提交

config.py

@@ -0,0 +1,24 @@
+from dataclasses import dataclass
+from pathlib import Path
+import os
+
+
+@dataclass(frozen=True, slots=True)
+class Settings:
+    api_key: str | None
+    base_url: str
+    model: str
+    default_system_prompt: str
+    data_dir: Path
+
+    @classmethod
+    def from_env(cls) -> "Settings":
+        return cls(
+            api_key=os.getenv("DEEPSEEK_API_KEY"),
+            base_url=os.getenv("DEEPSEEK_BASE_URL", "https://api.deepseek.com"),
+            model=os.getenv("DEEPSEEK_MODEL", "deepseek-v4-flash"),
+            default_system_prompt=os.getenv(
+                "DEFAULT_SYSTEM_PROMPT", "You are a helpful assistant."
+            ),
+            data_dir=Path(os.getenv("CHAT_DATA_DIR", "data")),
+        )