fix: use DISABLE_SWAGGER_UI environment variable instead of invalid flag

- Remove invalid --disable_swagger command flag
- Add DISABLE_SWAGGER_UI=true environment variable
- Fixes LiteLLM startup error

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

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

ai/compose.yaml

@@ -99,6 +99,7 @@ services:
       LITELLM_MASTER_KEY: ${AI_LITELLM_API_KEY}
       DATABASE_URL: postgresql://${AI_DB_USER}:${AI_DB_PASSWORD}@ai_postgres:5432/litellm
       LITELLM_DROP_PARAMS: 'true'
+      DISABLE_SWAGGER_UI: 'true'
     volumes:
       - ./litellm-config.yaml:/app/litellm-config.yaml:ro
     command:
@@ -110,8 +111,7 @@ services:
         '--port',
         '4000',
         '--detailed_debug',
-        '--drop_params',
-        '--disable_swagger'
+        '--drop_params'
       ]
     depends_on:
       - ai_postgres