Add company logos and Portainer URL

Move SDT and Urban Switch logo SVGs to public/logos/ with
theme-aware variants. Add logo fields to Company config.
Update sidebar header to show theme-responsive logo.
Add Portainer URL (port 9000) to external tools config.

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

src/shared/components/layout/sidebar.tsx

@@ -1,10 +1,13 @@
 'use client';
 
+import Image from 'next/image';
 import Link from 'next/link';
 import { usePathname } from 'next/navigation';
+import { useTheme } from 'next-themes';
 import { useMemo } from 'react';
 import * as Icons from 'lucide-react';
 import { buildNavigation } from '@/config/navigation';
+import { COMPANIES } from '@/config/companies';
 import { useFeatureFlag } from '@/core/feature-flags';
 import { cn } from '@/shared/lib/utils';
 import { ScrollArea } from '@/shared/components/ui/scroll-area';
@@ -37,6 +40,28 @@ function NavItem({ item, isActive }: { item: { id: string; label: string; icon:
   );
 }
 
+function SidebarLogo() {
+  const { resolvedTheme } = useTheme();
+  const sdt = COMPANIES['studii-de-teren'];
+  const logoSrc = sdt.logo
+    ? (resolvedTheme === 'dark' ? sdt.logo.dark : sdt.logo.light)
+    : null;
+
+  if (!logoSrc) {
+    return <Icons.LayoutDashboard className="h-5 w-5 text-primary" />;
+  }
+
+  return (
+    <Image
+      src={logoSrc}
+      alt={sdt.shortName}
+      width={28}
+      height={28}
+      className="h-7 w-7 shrink-0"
+    />
+  );
+}
+
 export function Sidebar() {
   const pathname = usePathname();
   const navGroups = useMemo(() => buildNavigation(), []);
@@ -44,7 +69,7 @@ export function Sidebar() {
   return (
     <aside className="flex h-full w-64 shrink-0 flex-col border-r bg-card">
       <div className="flex h-14 items-center gap-2 border-b px-4">
-        <Icons.LayoutDashboard className="h-5 w-5 text-primary" />
+        <SidebarLogo />
         <span className="text-lg font-semibold">ArchiTools</span>
       </div>