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* fix(server): drop the Chinese seed from the chat title prompt (MUL-5689) chatTitleSystemPrompt carried literal Chinese in two places: a rule that spelled out "Chinese input → Chinese title", and a formatting example listing "标题：" as a prefix not to use. It is the same defect as the quick-actions label rule — a prompt that names a language, even only as a formatting example, reads as permission to answer in it. Chat titles are generated from the user's opening message alone, so they have neither the ALREADY SUGGESTED feedback loop nor an agent reply to be pulled by. Removing the seed is the whole fix; the language rule stays, now stated without naming a language. Nothing is lost by dropping the "标题：" example: chatTitleLabelPrefixes already strips 标题/题目/主题 (and the English forms) from the model's output, which is where that guarantee actually lives. Co-authored-by: multica-agent <github@multica.ai> * fix(server): correct two inaccuracies in the quick-actions language rule Both from review on #6345, non-blocking there and deferred to keep that merge unblocked. "these instructions" was self-referential: the LANGUAGE RULE is itself an instruction, so a model reading "ignore these instructions when choosing the language" could read the rule as disowning itself. It means the system prompt, so it now says so. The system prompt claimed the user message "ends with" the LANGUAGE RULE. It does not — the task line follows it. Reworded to "contains a LANGUAGE RULE line near the end", which is what the renderer actually produces. The rule's position is unchanged: still after the conversation and the replayed labels, which is the part that matters. Co-authored-by: multica-agent <github@multica.ai> --------- Co-authored-by: Bohan-J <bohan@devv.ai> Co-authored-by: multica-agent <github@multica.ai>