feat: OpenRouter engine, with OPENROUTER_API_KEY env var

backend/src/app.py

@@ -10,6 +10,7 @@ from tortoise.expressions import Q
 from quart import Quart, Response, request, send_from_directory, jsonify, websocket
 from qdrant_client import QdrantClient
 import replicate
+from openrouter import OpenRouter
 
 import database as db
 import agent as agent_mod
@@ -36,7 +37,13 @@ class App(ChatMixin):
         if replicate_api_token:
             self.replicate_client = replicate.Client(api_token=replicate_api_token)
         else:
-            raise Exception("Horde only works with a replicate connection. Please provide an API Token.")
+            self.replicate_client = None
+
+        openrouter_api_key = os.getenv("OPENROUTER_API_KEY")
+        if openrouter_api_key:
+            self.openrouter_client = OpenRouter(api_key=openrouter_api_key)
+        else:
+            self.openrouter_client = None
 
         self.agent_classes = [
             agents_mod.ExpertAgent,