feat: add missing endpoints and keys

Author: marginal23326

.env.example

@@ -2,6 +2,7 @@ OPENAI_ENDPOINT=https://api.openai.com/v1
 OPENAI_API_KEY=
 
 ANTHROPIC_API_KEY=
+ANTHROPIC_ENDPOINT=https://api.anthropic.com
 
 GOOGLE_API_KEY=
 
@@ -11,6 +12,9 @@ AZURE_OPENAI_API_KEY=
 DEEPSEEK_ENDPOINT=https://api.deepseek.com
 DEEPSEEK_API_KEY=
 
+MISTRAL_API_KEY=
+MISTRAL_ENDPOINT=https://api.mistral.ai/v1
+
 OLLAMA_ENDPOINT=http://localhost:11434
 
 # Set to false to disable anonymized telemetry