add Mistral model configuration to environment example and documentation

Author: brauliolomeli

.env.example

@@ -184,6 +184,12 @@ MEDIUM_GOOGLE_MODEL=            # Default: gemini-1.5-flash-latest
 LARGE_GOOGLE_MODEL=             # Default: gemini-1.5-pro-latest
 EMBEDDING_GOOGLE_MODEL=         # Default: text-embedding-004
 
+# Mistral Configuration
+MISTRAL_MODEL=
+SMALL_MISTRAL_MODEL=            # Default: mistral-small-latest
+MEDIUM_MISTRAL_MODEL=           # Default: mistral-large-latest
+LARGE_MISTRAL_MODEL=            # Default: mistral-large-latest
+
 # Groq Configuration
 GROQ_API_KEY=                   # Starts with gsk_
 SMALL_GROQ_MODEL=               # Default: llama-3.1-8b-instant

docs/docs/advanced/fine-tuning.md

@@ -22,6 +22,7 @@ enum ModelProviderName {
     LLAMACLOUD,
     LLAMALOCAL,
     GOOGLE,
+    MISTRAL,
     REDPILL,
     OPENROUTER,
     HEURIST,