feat: use pydantic-settings for server host/port configuration

pyproject.toml

@@ -8,6 +8,7 @@ dependencies = [
     "fastapi==0.118.0",
     "httpx>=0.27.0",
     "pydantic==2.12.5",
+    "pydantic-settings==2.13.1",
     "regopy>=1.2.0",
     "uvicorn==0.37.0",
 ]

src/config.py

@@ -0,0 +1,11 @@
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    host: str = "127.0.0.1"
+    port: int = 8338
+
+    model_config = SettingsConfigDict(env_prefix="POLICY_SERVER_")
+
+
+settings = Settings()

src/main.py

@@ -7,6 +7,7 @@
 
 import uvicorn
 
+from src.config import settings
 from src.server.server import app, get_registry
 from src.server.models import ToolUseEvent, PostFileEditEvent
 
@@ -31,9 +32,9 @@ def main():
     setup_all_policies()
 
     print("Server ready with policy enforcement active!")
-    print("Starting server on http://localhost:8338")
+    print(f"Starting server on http://{settings.host}:{settings.port}")
 
-    uvicorn.run(app, host="0.0.0.0", port=8338, log_level="info")
+    uvicorn.run(app, host=settings.host, port=settings.port, log_level="info")
 
 
 if __name__ == "__main__":