perf: optimize LiteLLM for better performance

Reduce database logging overhead and enable prompt caching:

- Disabled verbose logging (set_verbose: false)
- Disabled spend tracking logs to reduce DB writes
- Disabled tag tracking and daily spend logs
- Removed success/failure callbacks
- Enabled prompt caching for claude-sonnet-4.5
- Set log level to ERROR only
- Removed --detailed_debug flag from command

This should significantly improve response times by eliminating
unnecessary database writes for every request.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

ai/litellm-config.yaml

@@ -9,7 +9,8 @@ model_list:
       model: anthropic/claude-sonnet-4-5-20250929
       api_key: os.environ/ANTHROPIC_API_KEY
       drop_params: true
-      additional_drop_params: ["prompt_cache_key"]
+      # Enable prompt caching for better performance
+      supports_prompt_caching: true
 
   - model_name: claude-3-5-sonnet
     litellm_params:
@@ -28,15 +29,16 @@ model_list:
 
 litellm_settings:
   drop_params: true
-  set_verbose: true
-  # Disable prompt caching features
-  cache: false
+  set_verbose: false  # Disable verbose logging for better performance
+  # Enable prompt caching for better performance
+  cache: true
   # Force strip specific parameters globally
   allowed_fails: 0
   # Modify params before sending to provider
   modify_params: true
-  # Drop prompt_cache_key globally for all models
-  additional_drop_params: ["prompt_cache_key"]
+  # Enable success and failure logging but minimize overhead
+  success_callback: []  # Disable all success callbacks to reduce DB writes
+  failure_callback: []  # Disable all failure callbacks
 
 router_settings:
   allowed_fails: 0
@@ -47,3 +49,9 @@ default_litellm_params:
 
 general_settings:
   disable_responses_id_security: true
+  # Disable spend tracking to reduce database overhead
+  disable_spend_logs: true
+  # Disable tag tracking
+  disable_tag_tracking: true
+  # Disable daily spend updates
+  disable_daily_spend_logs: true