feat(brand): adopt official Ordinis logo assets

Делёные design team 2026-05-11 в Downloads/files:
  - ordinis-mark.svg — двойные орбиты + 6 dots + gradient core
    (DeepBlue #185FA5 → SkyBlue #378ADD), brand spec
  - ordinis-favicon.svg — minimal 32px variant
  - ordinis-appicon.svg — 1024px PWA icon с dark rounded tile
  - ordinis-lockup-light/dark.svg — horizontal lockup с wordmark
    (для landing/splash/marketing — пока не используется но
    хранится в public для future use)

Changes:
- public/favicon.svg → minimal 32px variant
- Sidebar logo block: inline ordinis-mark с двойными орбитами +
  gradient core. Wordmark 'ORDINIS MDM' остаётся в Tektur.
- index.html: theme-color #185FA5 (был #120a8f), apple-touch-icon
  link на appicon, mask-icon color match.

Note: SVG colors hardcoded в Sidebar inline для full design fidelity
(brand assets specifically defined gradient). currentColor не подходит
т.к. brand требует точные DeepBlue/SkyBlue/LightBlue tokens.

ordinis-admin-ui/public/ordinis-lockup-dark.svg

@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 560 200" width="560" height="200">
+  <title>Ordinis MDM — horizontal lockup, dark</title>
+  <rect width="560" height="200" fill="#042C53"/>
+  <g transform="translate(100 100)">
+    <circle r="76" fill="none" stroke="#85B7EB" stroke-width="1" opacity="0.55"/>
+    <circle r="49" fill="none" stroke="#85B7EB" stroke-width="1" opacity="0.55"/>
+    <circle cx="76" cy="0" r="6.5" fill="#FFFFFF"/>
+    <circle cx="-38" cy="65.82" r="6.5" fill="#85B7EB"/>
+    <circle cx="-38" cy="-65.82" r="6.5" fill="#85B7EB"/>
+    <circle cx="-49" cy="0" r="5.2" fill="#FFFFFF"/>
+    <circle cx="24.5" cy="-42.43" r="5.2" fill="#85B7EB"/>
+    <circle cx="24.5" cy="42.43" r="5.2" fill="#85B7EB"/>
+    <circle r="12" fill="#FFFFFF"/>
+  </g>
+  <text x="220" y="108" font-family="Inter, 'Helvetica Neue', Arial, sans-serif" font-size="52" font-weight="500" fill="#FFFFFF" letter-spacing="1">Ordinis</text>
+  <text x="222" y="138" font-family="Inter, 'Helvetica Neue', Arial, sans-serif" font-size="12" font-weight="400" fill="#85B7EB" letter-spacing="5">MDM PLATFORM</text>
+</svg>