[Repo Assist] fix: honour PreferStructuredCategories setting in notification categorizer

[github-actions]

🤖 This is an automated draft PR from Repo Assist.

Summary

PreferStructuredCategories was persisted in SettingsManager and SettingsData (default true) but never read. The categorizer always ran the full pipeline — Intent → Channel → UserRules → keyword fallback — regardless of the user's preference.

Root cause

NotificationCategorizer.Classify() had no parameter to opt out of the structured metadata steps. OpenClawGatewayClient also had no way to forward the setting to the categorizer.

Fix

• NotificationCategorizer.Classify() gains a bool preferStructuredCategories = true parameter. When false, the Intent and Channel checks (steps 1–2) are skipped; classification starts from user-defined rules then keyword fallback. The default keeps all existing behaviour.
• OpenClawGatewayClient gains SetPreferStructuredCategories(bool) and stores the flag. Both EmitNotification and EmitChatNotification forward it to Classify().
• App.xaml.cs calls SetPreferStructuredCategories(_settings.PreferStructuredCategories) when initialising the gateway client.

Trade-offs

• No breaking API change: Classify() is backward-compatible via a default parameter. Callers that don't pass the flag continue to work exactly as before.
• This PR intentionally does not bundle the UserRules wiring — that is addressed separately in PR [Repo Assist] fix: pass UserRules to NotificationCategorizer in OpenClawGatewayClient #93 to keep each fix reviewable on its own.

Relationship to PR #93

Both PRs touch OpenClawGatewayClient.cs and App.xaml.cs. If #93 merges first, a brief rebase will be needed to resolve the overlapping lines; no semantic conflict exists.

Test Status

dotnet test tests/OpenClaw.Shared.Tests/ Passed! - Failed: 0, Passed: 508, Skipped: 18, Total: 526 

Five new tests cover the preferStructuredCategories = false branch:

• PreferStructuredCategories_False_SkipsIntent
• PreferStructuredCategories_False_SkipsChannel
• PreferStructuredCategories_False_UserRulesStillApply
• PreferStructuredCategories_False_FallsBackToKeywords
• PreferStructuredCategories_True_Default_BehaviourUnchanged

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