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/compose.yaml

@@ -99,6 +99,9 @@ services:
       LITELLM_DROP_PARAMS: 'true'
       NO_DOCS: 'true'
       NO_REDOC: 'true'
+      # Performance optimizations
+      LITELLM_LOG: 'ERROR'  # Only log errors
+      LITELLM_MODE: 'PRODUCTION'  # Production mode for better performance
     volumes:
       - ./litellm-config.yaml:/app/litellm-config.yaml:ro
     command:
@@ -109,7 +112,6 @@ services:
         '0.0.0.0',
         '--port',
         '4000',
-        '--detailed_debug',
         '--drop_params'
       ]
     depends_on: