Add a special ProviderType for openrouter

We can later alias it to openai if we decide to merge them.

Author: jhrozek

Diff for: src/codegate/db/models.py

@@ -128,6 +128,7 @@ class ProviderType(str, Enum):
     ollama = "ollama"
     lm_studio = "lm_studio"
     llamacpp = "llamacpp"
+    openrouter = "openai"
 
 
 class GetPromptWithOutputsRow(BaseModel):

Diff for: src/codegate/muxing/adapter.py

@@ -106,6 +106,8 @@ def __init__(self):
             db_models.ProviderType.anthropic: self._format_antropic,
             # Our Lllamacpp provider emits OpenAI chunks
             db_models.ProviderType.llamacpp: self._format_openai,
+            # OpenRouter is a dialect of OpenAI
+            db_models.ProviderType.openrouter: self._format_openai,
         }
 
     def _format_ollama(self, chunk: str) -> str:

Diff for: src/codegate/server.py

@@ -73,7 +73,7 @@ async def log_user_agent(request: Request, call_next):
 
     # Register all known providers
     registry.add_provider(
-        ProviderType.openai,
+        ProviderType.openrouter,
         OpenAIProvider(pipeline_factory),
     )
     registry.add_provider(