chore: 集成 LLM 增强 — config/main/articles schema/workers + .env.example 加 Agnes 配置

backend/app/config.py

@@ -92,6 +92,15 @@ class Settings(BaseSettings):
     domain: str = ""
     acme_email: str = ""
 
+    # ===== Agnes LLM(智能增强)=====
+    # 留空 = 不启用 LLM 增强(翻译后只走默认排版,提示词也不读)
+    agnes_api_key: str = ""
+    agnes_base_url: str = "https://apihub.agnes-ai.com/v1"
+    agnes_chat_model: str = "agnes-2.0-flash"
+    agnes_image_model: str = "agnes-image-2.1-flash"
+    # 全局 LLM 调用间隔(秒),避免被限流
+    llm_interval_sec: float = 2.0
+
     # ===== 内部路径(部署后可调) =====
     project_root: Path = Path(__file__).resolve().parents[2]