Docs: ConversationDetails example in docs/openapi.json is syntactically invalid (missing comma)

[coderabbitai]

Summary
The Python example embedded in the ConversationDetails schema description within docs/openapi.json is syntactically invalid due to a missing comma, causing the example snippet to be unparsable as written.

Where

• File: docs/openapi.json
• Component: components/schemas/ConversationDetails description "Example" block
• Context: This was identified during review of PR LCORE-1169: Up-to-date OpenAPI documentation #1019 (link below).

Impact

• The rendered documentation includes an invalid Python example, which could mislead users copying the snippet.

Requested action

• Update the example so it is valid Python syntax.

References

• PR: LCORE-1169: Up-to-date OpenAPI documentation #1019
• Review comment: LCORE-1169: Up-to-date OpenAPI documentation #1019 (comment)

Requested by

• @tisnik