fix(infra): 3 mejoras críticas — minify script + Quart producción + particionamiento bloqueado

- scripts/minify-assets.sh: excluye archivos .min.* para evitar .min.min.*
- nginx/nexus-pos.conf: agrega upstream nexus_quart + location /pos/api/catalog/async-search
- nexus-quart.service: servicio systemd para hypercorn en puerto 5002
- particionamiento vehicle_parts: BLOQUEADO — tabla 254 GB, disco solo 177 GB libres

nginx/nexus-pos.conf

@@ -13,6 +13,10 @@ upstream nexus_pos {
     server 127.0.0.1:5001;
 }
 
+upstream nexus_quart {
+    server 127.0.0.1:5002;
+}
+
 # Gzip compression
 gzip on;
 gzip_vary on;
@@ -93,6 +97,20 @@ server {
         proxy_buffers 8 4k;
     }
 
+    # Async catalog search via Quart+asyncpg (non-blocking I/O)
+    location /pos/api/catalog/async-search {
+        proxy_pass http://nexus_quart;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header X-Tenant-Subdomain $tenant;
+        proxy_connect_timeout 5s;
+        proxy_send_timeout 30s;
+        proxy_read_timeout 30s;
+        proxy_buffering off;
+    }
+
     # Rate limit login endpoint
     location /pos/api/auth/login {
         limit_req zone=pos_login burst=5 nodelay;