feat: add profiles table and RLS policies for user customer data

shop/supabase/migrations/20260430230348_add_profiles_table.sql

@@ -0,0 +1,21 @@
+-- Profiles Table
+CREATE TABLE IF NOT EXISTS public.profiles (
+    id UUID PRIMARY KEY REFERENCES auth.users(id) ON DELETE CASCADE,
+    first_name TEXT,
+    last_name TEXT,
+    company_name TEXT,
+    vat_id TEXT,
+    address TEXT,
+    city TEXT,
+    zip_code TEXT,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT timezone('utc'::text, now()) NOT NULL
+);
+
+-- Enable RLS
+ALTER TABLE public.profiles ENABLE ROW LEVEL SECURITY;
+
+-- Policies
+CREATE POLICY "Users can view their own profile" ON public.profiles FOR SELECT USING (auth.uid() = id);
+CREATE POLICY "Users can update their own profile" ON public.profiles FOR UPDATE USING (auth.uid() = id);
+CREATE POLICY "Users can insert their own profile" ON public.profiles FOR INSERT WITH CHECK (auth.uid() = id);
+CREATE POLICY "Admins can view all profiles" ON public.profiles FOR SELECT USING (auth.role() = 'authenticated');