feat(FN-3195): document llama.cpp provider setup and onboarding

Docs(FN-3195): adds llama.cpp provider setup and onboarding documentation to the main and dashboard READMEs.

Fusion-Task-Id: FN-3195

packages/pi-llama-cpp/src/constants.ts

@@ -0,0 +1,5 @@
+export const PROVIDER_ID = "llama-server";
+export const PROVIDER_NAME = "Llama.cpp";
+export const DEFAULT_LLAMA_SERVER_URL = "http://127.0.0.1:8080";
+export const DEFAULT_MAX_TOKENS = 32000;
+export const DEFAULT_CONTEXT_WINDOW = 128000;