feat: Implementar sistema de disponibilidad y corregir errores de kiosko

- Agregar API routes de disponibilidad (blocks, staff, time-slots, staff-unavailable)
- Corregir autenticación en availability routes (reemplazar get_current_user_role con validación Bearer)
- Corregir DELETE en blocks/route.ts para usar query parameters
- Corregir errores de tipos en kiosk routes (supabase → supabaseAdmin)
- Agregar layout raíz de Next.js y estilos globales
- Agregar componente Badge UI
- Corregir tipos TypeScript en WalkInFlow
- Instalar dependencias necesarias (@radix-ui/*, class-variance-authority, etc)
- Agregar migraciones de disponibilidad

app/api/availability/staff/route.ts

@@ -0,0 +1,46 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { supabaseAdmin } from '@/lib/supabase/client'
+
+export async function GET(request: NextRequest) {
+  try {
+    const { searchParams } = new URL(request.url)
+    const locationId = searchParams.get('location_id')
+    const startTime = searchParams.get('start_time_utc')
+    const endTime = searchParams.get('end_time_utc')
+
+    if (!locationId || !startTime || !endTime) {
+      return NextResponse.json(
+        { error: 'Missing required parameters: location_id, start_time_utc, end_time_utc' },
+        { status: 400 }
+      )
+    }
+
+    const { data: staff, error: staffError } = await supabaseAdmin.rpc('get_available_staff', {
+      p_location_id: locationId,
+      p_start_time_utc: startTime,
+      p_end_time_utc: endTime
+    })
+
+    if (staffError) {
+      return NextResponse.json(
+        { error: staffError.message },
+        { status: 400 }
+      )
+    }
+
+    return NextResponse.json({
+      success: true,
+      staff: staff || [],
+      location_id: locationId,
+      start_time_utc: startTime,
+      end_time_utc: endTime,
+      available_count: staff?.length || 0
+    })
+  } catch (error) {
+    console.error('Available staff GET error:', error)
+    return NextResponse.json(
+      { error: 'Internal server error' },
+      { status: 500 }
+    )
+  }
+}