feat: add Nginx, Windows and Firefox brand icons

- Nginx: siNginx (#009639) — keywords: nginx
- Windows: custom icon (#0078D4) — keywords: windows, win10, win11, winserver, windows server
- Firefox: siFirefox (#FF7139) — keywords: firefox
- Apache/Apache2 was already supported (no change needed)

Update README (en/fr/es) brand tables accordingly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/brandIcons.js

@@ -4,7 +4,7 @@ import {
   siSchneiderelectric,
   siUbiquiti, siMikrotik, siCisco, siTplink, siAsus, siNetgear, siPfsense, siOpnsense, siOpenwrt,
   siFortinet,
-  siApache, siTraefikproxy, siApacheguacamole,
+  siApache, siNginx, siTraefikproxy, siApacheguacamole,
   siAuthelia, siKeycloak, siAuthentik, siOkta, siAuth0,
   siOrange, siOvh,
   siBitwarden, siVaultwarden, si1password, siKeepassxc, siVault,
@@ -14,7 +14,7 @@ import {
   siOpsgenie, siPagerduty,
   siElastic, siKibana, siLogstash, siSplunk, siGraylog, siJaeger, siOpentelemetry,
   siApple,
-  siDebian, siUbuntu,
+  siDebian, siUbuntu, siFirefox,
   siAnsible,
   siDell, siHp,
   siRaspberrypi, siArduino,
@@ -110,6 +110,12 @@ const ICON_PRTG = {
   path: 'M20.38 8.57l-1.23 1.85a8 8 0 0 1-.22 7.58H5.07A8 8 0 0 1 15.58 6.85l1.85-1.23A10 10 0 0 0 3.35 19a2 2 0 0 0 1.72 1h13.85a2 2 0 0 0 1.74-1 10 10 0 0 0-.27-10.44zm-9.79 6.84a2 2 0 0 0 2.83 0l5.66-8.49-8.49 5.66a2 2 0 0 0 0 2.83z',
 }
 
+const ICON_WINDOWS = {
+  title: 'Windows',
+  hex: '0078D4',
+  path: 'M0 3.449L9.75 2.1v9.451H0m10.949-9.602L24 0v11.4h-13.051M0 12.6h9.75v9.451L0 20.699M10.949 12.6H24V24l-13.051-1.8',
+}
+
 // Ordre : du plus spécifique au plus générique pour éviter les faux positifs.
 const BRANDS = [
   // Hyperviseurs / virtualisation
@@ -149,6 +155,7 @@ const BRANDS = [
 
   // Serveurs web / proxy
   { kw: ['apache', 'apache2', 'httpd'],                   icon: siApache },
+  { kw: ['nginx'],                                        icon: siNginx },
   { kw: ['traefik'],                                      icon: siTraefikproxy },
   { kw: ['guacamole'],                                    icon: siApacheguacamole },
 
@@ -212,9 +219,13 @@ const BRANDS = [
   { kw: ['apple', 'iphone', 'ipad', 'ipados', 'macbook', 'imac', 'mac mini', 'mac pro', 'mac studio', 'macos', 'mac os', 'ios', 'icloud', 'airpods', 'airdrop'], icon: { ...siApple, hex: '555555' } },
 
   // OS / distros
+  { kw: ['windows', 'win10', 'win11', 'winserver', 'windows server'], icon: ICON_WINDOWS },
   { kw: ['debian'],                                       icon: siDebian },
   { kw: ['ubuntu'],                                       icon: siUbuntu },
 
+  // Navigateurs
+  { kw: ['firefox'],                                      icon: siFirefox },
+
   // Automatisation
   { kw: ['ansible'],                                      icon: siAnsible },