feat: add Free, Bouygues Telecom and SFR brand icons

None of the three are in simple-icons — custom wifi icons with
official brand colors (Free #CD1126, Bouygues #0099CC, SFR #E2001A).
Keywords avoid the bare word "free" to prevent false positives on
freenas/freebsd/etc.

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

frontend/src/brandIcons.js

@@ -24,6 +24,24 @@ import {
 } from 'simple-icons'
 
 // Icônes personnalisées (absentes de simple-icons) — même format { title, hex, path }.
+const ICON_FREE = {
+  title: 'Free',
+  hex: 'CD1126',
+  path: 'M1 9l2 2c4.97-4.97 13.03-4.97 18 0l2-2C16.93 2.93 7.08 2.93 1 9zm8 8l3 3 3-3c-1.65-1.66-4.34-1.66-6 0zm-4-4l2 2c2.76-2.76 7.24-2.76 10 0l2-2C15.14 9.14 8.87 9.14 5 13z',
+}
+
+const ICON_BOUYGUES = {
+  title: 'Bouygues Telecom',
+  hex: '0099CC',
+  path: 'M1 9l2 2c4.97-4.97 13.03-4.97 18 0l2-2C16.93 2.93 7.08 2.93 1 9zm8 8l3 3 3-3c-1.65-1.66-4.34-1.66-6 0zm-4-4l2 2c2.76-2.76 7.24-2.76 10 0l2-2C15.14 9.14 8.87 9.14 5 13z',
+}
+
+const ICON_SFR = {
+  title: 'SFR',
+  hex: 'E2001A',
+  path: 'M1 9l2 2c4.97-4.97 13.03-4.97 18 0l2-2C16.93 2.93 7.08 2.93 1 9zm8 8l3 3 3-3c-1.65-1.66-4.34-1.66-6 0zm-4-4l2 2c2.76-2.76 7.24-2.76 10 0l2-2C15.14 9.14 8.87 9.14 5 13z',
+}
+
 const ICON_ARCHIVE = {
   title: 'Archive',
   hex: '78716C',
@@ -66,6 +84,9 @@ const BRANDS = [
   // FAI français
   { kw: ['orange', 'sosh', 'livebox'],                    icon: siOrange },
   { kw: ['ovh', 'ovhcloud', 'kimsufi', 'soyoustart'],    icon: siOvh },
+  { kw: ['freebox', 'free mobile', 'free telecom', 'iliad'], icon: ICON_FREE },
+  { kw: ['bouygues', 'bbox'],                             icon: ICON_BOUYGUES },
+  { kw: ['sfr', 'red by sfr', 'sfr box'],                 icon: ICON_SFR },
 
   // Serveurs web / proxy
   { kw: ['apache', 'apache2', 'httpd'],                   icon: siApache },