first commit

backend/app/config.py

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+from functools import lru_cache
+from typing import Optional
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(
+        env_file=".env",
+        env_file_encoding="utf-8",
+        extra="ignore",
+    )
+
+    # Application
+    app_name: str = "PromptCR-Lab"
+    debug: bool = False
+
+    # Database (psycopg2 preferred; fall back to psycopg3 if not built)
+    database_url: str = "postgresql+psycopg://postgres:postgres@localhost:5432/promptcr"
+
+    # Model API keys (loaded from environment, never hardcoded)
+    deepseek_api_key: Optional[str] = None
+    deepseek_base_url: str = "https://api.deepseek.com/v1"
+    deepseek_model: str = "deepseek-chat"
+
+    kimi_api_key: Optional[str] = None
+    kimi_base_url: str = "https://api.moonshot.cn/v1"
+    kimi_model: str = "moonshot-v1-8k"
+
+    qwen_api_key: Optional[str] = None
+    qwen_base_url: str = "https://dashscope.aliyuncs.com/compatible-mode/v1"
+    qwen_model: str = "qwen-turbo"
+
+    # Defaults
+    default_model_concurrency: int = 5
+    default_max_retries: int = 3
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()