chore(domain): migrate to nexusautoparts.com.mx

- Update Nginx config:
  - nexusautoparts.com.mx -> POS (port 5001)
  - admin.nexusautoparts.com.mx -> Dashboard (port 5000)
  - nexus.consultoria-as.com -> legacy redirect (dashboard)
  - Add redirect / -> /pos/login for main domain
- Update domain references in code:
  - capacitor.config.json (mobile apps)
  - pos/mobile/README.md
  - pos/config.py SMTP_FROM
- Add Caddy config docs for reverse proxy VM (192.168.10.74)

pos/capacitor.config.json

@@ -3,7 +3,7 @@
   "appName": "Nexus POS",
   "webDir": "www",
   "server": {
-    "url": "https://nexus.consultoria-as.com/pos",
+    "url": "https://nexusautoparts.com.mx/pos",
     "cleartext": true
   },
   "plugins": {

pos/config.py

@@ -57,7 +57,7 @@ SMTP_HOST = os.environ.get('SMTP_HOST', 'smtp.gmail.com')
 SMTP_PORT = int(os.environ.get('SMTP_PORT', '587'))
 SMTP_USER = os.environ.get('SMTP_USER', '')
 SMTP_PASS = os.environ.get('SMTP_PASS', '')
-SMTP_FROM = os.environ.get('SMTP_FROM', 'noreply@nexusautoparts.com')
+SMTP_FROM = os.environ.get('SMTP_FROM', 'noreply@nexusautoparts.com.mx')
 
 # ─── WhatsApp Bridge ───────────────────────────────────────────────────────
 WHATSAPP_BRIDGE_URL = os.environ.get('WHATSAPP_BRIDGE_URL', 'http://localhost:21465')

pos/mobile/README.md

@@ -8,7 +8,7 @@
 ## Architecture
 
 The Capacitor app loads the POS from the remote server at
-`https://nexus.consultoria-as.com/pos`. This means:
+`https://nexusautoparts.com.mx/pos`. This means:
 - The app requires internet on first load.
 - The PWA service worker handles offline caching after that.
 - No HTML/JS/CSS is bundled into the native binary.