feat(rx): multi-tenant por clinica_id + página /clients de clientes ativos

- clinica_id (tenant do scoreodonto, clinicas.id) como eixo de isolamento em
  clinics_devices e images (+índices); clinic_name vira rótulo legível.
- Cadastro de device, socket (machine_token) e uploads (direct + legado) gravam clinica_id.
- Listagens (/images, /patients, /by-patient, /unique-clinics) filtram por clinica_id.
- /clients: lista clientes Windows ativos (inclui autenticados sem client-identify),
  tempo real + polling, exibe a clínica.
- send-image marcado como legado (client real usa Direct Upload).

Inclui trabalho de dev acumulado no working tree (não havia commits desde origin/main).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docker-compose-dev.yml

@@ -0,0 +1,28 @@
+version: '3.8'
+
+services:
+  dev-api:
+    image: node:20
+    container_name: rx_dev_api
+    network_mode: "host"
+    working_dir: /app
+    volumes:
+      - ./dental-server:/app
+      - /app/node_modules
+    command: >
+      sh -c "npm install && npm run dev"
+    env_file:
+      - ./dental-server/.env
+    restart: unless-stopped
+
+  dev-client:
+    image: node:20
+    container_name: rx_dev_client
+    network_mode: "host"
+    working_dir: /app
+    volumes:
+      - ./dental-server/dental-client:/app
+      - /app/node_modules
+    command: >
+      sh -c "npm install && npx vite --host 0.0.0.0 --port 5173"
+    restart: unless-stopped