Initial commit: PastPaper Master full stack

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/config.py

@@ -0,0 +1,36 @@
+from pydantic_settings import BaseSettings
+from functools import lru_cache
+import os
+
+
+class Settings(BaseSettings):
+    # Supabase
+    supabase_url: str
+    supabase_anon_key: str
+    supabase_service_role_key: str
+
+    # LLM - laozhang (gpt-4o, gpt-4o-mini)
+    laozhang_base_url: str = "https://api.laozhang.ai/v1"
+    laozhang_api_key: str = ""
+
+    # LLM - DashScope (qwen-plus)
+    dashscope_base_url: str = "https://dashscope.aliyuncs.com/compatible-mode/v1"
+    dashscope_api_key: str = ""
+
+    # LLM - DeepSeek
+    deepseek_base_url: str = "https://api.deepseek.com/v1"
+    deepseek_api_key: str = ""
+
+    # Google Gemini (official)
+    google_gemini_api_key: str = ""
+
+    model_config = {
+        "env_file": os.path.join(os.path.dirname(__file__), "../../.env"),
+        "env_file_encoding": "utf-8",
+        "extra": "ignore",
+    }
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()