Add new model provider PPIO (#3211)

* feat: add new model provider PPIO

* fix: fix ppio model fetching

* fix: code lint

* reorder LLM
update interface for streaming and chats to use valid keys
linting

---------

Co-authored-by: timothycarambat <rambat1010@gmail.com>

server/utils/helpers/updateENV.js

@@ -615,6 +615,16 @@ const KEY_MAPPING = {
       },
     ],
   },
+
+  // PPIO Options
+  PPIOApiKey: {
+    envKey: "PPIO_API_KEY",
+    checks: [isNotEmpty],
+  },
+  PPIOModelPref: {
+    envKey: "PPIO_MODEL_PREF",
+    checks: [isNotEmpty],
+  },
 };
 
 function isNotEmpty(input = "") {
@@ -721,6 +731,7 @@ function supportedLLM(input = "") {
     "apipie",
     "xai",
     "nvidia-nim",
+    "ppio",
   ].includes(input);
   return validSelection ? null : `${input} is not a valid LLM provider.`;
 }