feat: support gemini-2.0-flash

- Enhance model support by adding new entries and refining checks for system instruction compatibility.
- Update logging display behavior and adjust default quotas for better user experience.
- Revamp pricing structures in the billing system to reflect current model values and deprecate outdated entries.
- Streamline code by replacing hardcoded values with configurations for maintainability.

web/default/src/components/LogsTable.js

@@ -564,7 +564,7 @@ const LogsTable = () => {
                         {log.completion_tokens ? log.completion_tokens : ''}
                       </Table.Cell>
                       <Table.Cell>
-                        {log.quota ? renderQuota(log.quota, t, 6) : ''}
+                        {log.quota ? renderQuota(log.quota, t, 6) : 'free'}
                       </Table.Cell>
                     </>
                   )}

web/default/src/helpers/utils.js

@@ -224,4 +224,4 @@ export function getChannelModels(type) {
     return channelModels[type];
   }
   return [];
-}
+}