feat: add support for Anthropic provider, including configuration and conversion utilities

config/sample_config.ini

@@ -1,7 +1,31 @@
+[base]
+# provider can be [ openai|openrouter|anthropic|google]
+provider = openrouter
+
+[openrouter]
+api_key = YOUR_API_KEY
+base_url = https://openrouter.ai/api/v1
+model = openai/gpt-4o-2024-11-20
+context_window = 128000
+
+[anthropic]
+api_key = YOUR_API_KEY
+base_url = https://api.anthropic.com/v1/messages
+model = claude-3-7-sonnet-20250219
+context_window = 128000
+
+[google]
+api_key = YOUR_API_KEY
+base_url = https://generativelanguage.googleapis.com/v1beta/generateContent
+model = gemini-2.0-flash
+context_window = 1000000
+
+
 [openai]
 api_key = YOUR_API_KEY
-base_url = CUSTOM_BASE_URL
-model = YOUR_MODEL_ID
+base_url = https://api.openai.com/v1
+model = openai/gpt-4o
+context_window = 128000
 
 [mcp]
 servers_json = config/mcp_config.json