fix: disable drop_params to preserve streaming metadata in LiteLLM

- Set drop_params: false in litellm_settings
- Set modify_params: false in litellm_settings
- Set drop_params: false in default_litellm_params
- Commented out LITELLM_DROP_PARAMS env var
- Removed --drop_params command flag

These settings were stripping critical streaming parameters causing
vLLM streaming responses to collapse into empty deltas

ai/compose.yaml

@@ -100,7 +100,7 @@ services:
       ANTHROPIC_API_KEY: ${ANTHROPIC_API_KEY}
       LITELLM_MASTER_KEY: ${AI_LITELLM_API_KEY}
       DATABASE_URL: postgresql://${AI_DB_USER}:${AI_DB_PASSWORD}@ai_postgres:5432/litellm
-      LITELLM_DROP_PARAMS: 'true'
+      # LITELLM_DROP_PARAMS: 'true'  # DISABLED: Was breaking streaming
       NO_DOCS: 'true'
       NO_REDOC: 'true'
       # Performance optimizations
@@ -115,8 +115,7 @@ services:
         '--host',
         '0.0.0.0',
         '--port',
-        '4000',
-        '--drop_params'
+        '4000'
       ]
     depends_on:
       - ai_postgres