fix(core): make autoUpdateConversationModel work without rule

[dingyi222666]

Fixes #1012

Root cause: the auto-update trigger in resolve_conversation required
resolved.constraint.autoUpdateModel === true, but resolveConstraint
defaulted autoUpdateModel to undefined when no rule was configured for the
route. So undefined === true was always false and the global
autoUpdateConversationModel switch never took effect.

Fix: default autoUpdateModel to true in resolveConstraint when no rule
sets it. The global switch now works as documented; per-route opt-out is still
possible via rule autoUpdateModel: false or fixedModel.

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Reviewing files that changed from the base of the PR and between f6efb03 and 4eda170.

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• packages/core/src/services/conversation.ts

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Walkthrough

resolveConstraint 在未显式配置 autoUpdateModel 时将其设为 true。显式配置的值保持不变。

Changes

会话模型约束

Layer / File(s)	Summary
解析 autoUpdateModel 默认值 packages/core/src/services/conversation.ts	resolveConstraint 在 autoUpdateModel 未定义时返回 true，否则返回已配置的值。

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• ChatLunaLab/chatluna#990：同样修改 packages/core/src/services/conversation.ts 中的 resolveConstraint，并引入了 autoUpdateModel 字段。

Poem

兔子看见默认值，
未配置时跳向 true。
显式设置仍保留，
会话模型随约束。
代码改动轻又稳，
胡萝卜庆祝此修复。

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/auto-update-model-rule

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[dingyi222666]

关闭此 PR，修复直接合入 #1015