Add 9 missing Blazor Razor workflow files for Cafe and Restaurant POS verticals
Cafe (2 files):
- CafeJourney.razor: 5-step café workflow tracker
- MilkFoamOptions.razor: Milk foam/drink customization sub-options
Restaurant (7 files):
- RestaurantJourney.razor: 7-step restaurant workflow tracker
- AllergenWarning.razor: Allergen alert display with severity levels
- CourseTiming.razor: Multi-course meal timing management
- RestaurantMenuManagement.razor: Restaurant menu editor with quick actions
- OrderNote.razor: Order/item special notes with quick chips
- TableMergeSplit.razor: Table merge and split operations
- TableSelect.razor: Quick table selection with capacity matching
All files follow existing POS patterns: @layout PosLayout, @inherits PosBase,
bilingual EN/VI comments, section markers, CSS vars, FormatPrice, NavigateTo,
Lucide icons, hardcoded Vietnamese demo data with VND prices.
Co-authored-by: Velik <hongochai10@users.noreply.github.com>
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