feat: implement product categories with tabbed filtering and admin configuration

shop/supabase/migrations/20260430223125_add_categories_table.sql

@@ -0,0 +1,28 @@
+-- Categories Table
+CREATE TABLE IF NOT EXISTS public.categories (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    name TEXT NOT NULL,
+    description TEXT,
+    icon TEXT, -- Lucide icon name or similar
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT timezone('utc'::text, now()) NOT NULL
+);
+
+-- Add category_id to products
+ALTER TABLE public.products ADD COLUMN IF NOT EXISTS category_id UUID REFERENCES public.categories(id) ON DELETE SET NULL;
+
+-- Enable RLS
+ALTER TABLE public.categories ENABLE ROW LEVEL SECURITY;
+
+-- Policies
+CREATE POLICY "Allow public read access on categories" ON public.categories FOR SELECT USING (true);
+
+-- Seed Categories
+INSERT INTO public.categories (id, name, description, icon)
+VALUES 
+('c1a1a1a1-a1a1-a1a1-a1a1-a1a1a1a1a1a1', 'Cloud Software', 'Modulare Cloud-Lösungen für den modernen Handel.', 'Cloud'),
+('c2a2a2a2-a2a2-a2a2-a2a2-a2a2a2a2a2a2', 'Gastronomie', 'Kassensysteme und Management für Restaurants und Cafés.', 'Utensils'),
+('c3a3a3a3-a3a3-a3a3-a3a3-a3a3a3a3a3a3', 'Hardware', 'Kassenterminals, Drucker und Zubehör.', 'HardDrive');
+
+-- Update existing products with categories
+UPDATE public.products SET category_id = 'c1a1a1a1-a1a1-a1a1-a1a1-a1a1a1a1a1a1' WHERE name LIKE '%Cloud%';
+UPDATE public.products SET category_id = 'c2a2a2a2-a2a2-a2a2-a2a2-a2a2a2a2a2a2' WHERE name LIKE '%Gastro%';