feat: CRM Clinicas SaaS - MVP completo

- Auth: Login/Register con creacion de clinica
- Dashboard: KPIs reales, graficas recharts
- Pacientes: CRUD completo con busqueda
- Agenda: FullCalendar, drag-and-drop, vista recepcion
- Expediente: Notas SOAP, signos vitales, CIE-10
- Facturacion: Facturas con IVA, campos CFDI SAT
- Inventario: Productos, stock, movimientos, alertas
- Configuracion: Clinica, equipo, catalogo servicios
- Supabase self-hosted: 18 tablas con RLS multi-tenant
- Docker + Nginx para produccion

Co-Authored-By: claude-flow <ruv@ruv.net>

supabase/migrations/008_registration_policies.sql

@@ -0,0 +1,22 @@
+-- Fix: Allow new users to create clinics and profiles during registration
+-- The original RLS policies required a clinic_id which doesn't exist yet at signup time
+
+-- Allow any authenticated user to create a clinic (for registration flow)
+DO $$ BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_policies WHERE policyname = 'Authenticated users can create clinics' AND tablename = 'clinics'
+  ) THEN
+    CREATE POLICY "Authenticated users can create clinics" ON clinics
+      FOR INSERT WITH CHECK (auth.uid() IS NOT NULL);
+  END IF;
+END $$;
+
+-- Allow users to insert their own profile row
+DO $$ BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_policies WHERE policyname = 'Users can insert own profile' AND tablename = 'users'
+  ) THEN
+    CREATE POLICY "Users can insert own profile" ON users
+      FOR INSERT WITH CHECK (id = auth.uid());
+  END IF;
+END $$;