Config: Make API server literals case insensitive

There's no native way to handle case insensitivity in pydantic, so
add a validator which converts the API server input to be lowercase.

Signed-off-by: kingbri <bdashore3@proton.me>

common/config_models.py

@@ -1,5 +1,12 @@
 from pathlib import Path
-from pydantic import BaseModel, ConfigDict, Field, PrivateAttr
+from pydantic import (
+    BaseModel,
+    ConfigDict,
+    Field,
+    PrivateAttr,
+    field_validator,
+    validator,
+)
 from typing import List, Literal, Optional, Union
 
 
@@ -79,7 +86,7 @@ class NetworkConfig(BaseConfigModel):
             "NOTE: Only enable this for debug purposes."
         ),
     )
-    api_servers: Optional[List[Literal["OAI", "Kobold"]]] = Field(
+    api_servers: Optional[List[Literal["oai", "kobold"]]] = Field(
         ["OAI"],
         description=(
             'Select API servers to enable (default: ["OAI"]).\n'
@@ -87,6 +94,12 @@ class NetworkConfig(BaseConfigModel):
         ),
     )
 
+    # Converts all strings in the api_servers list to lowercase
+    # NOTE: Expand if more models need this validator
+    @field_validator("api_servers", mode="before")
+    def api_server_validator(cls, api_servers):
+        return [server_name.lower() for server_name in api_servers]
+
 
 # TODO: Migrate config.yml to have the log_ prefix
 # This is a breaking change.