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-appicon.svg

@@ -0,0 +1,21 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024" width="1024" height="1024">
+  <title>Ordinis — app icon</title>
+  <defs>
+    <linearGradient id="tile" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#185FA5"/>
+      <stop offset="1" stop-color="#042C53"/>
+    </linearGradient>
+  </defs>
+  <rect width="1024" height="1024" rx="220" fill="url(#tile)"/>
+  <g transform="translate(512 512)">
+    <circle r="300" fill="none" stroke="#85B7EB" stroke-width="4" opacity="0.5"/>
+    <circle r="195" fill="none" stroke="#85B7EB" stroke-width="4" opacity="0.5"/>
+    <circle cx="300" cy="0" r="26" fill="#FFFFFF"/>
+    <circle cx="-150" cy="259.81" r="26" fill="#85B7EB"/>
+    <circle cx="-150" cy="-259.81" r="26" fill="#85B7EB"/>
+    <circle cx="-195" cy="0" r="21" fill="#FFFFFF"/>
+    <circle cx="97.5" cy="-168.87" r="21" fill="#85B7EB"/>
+    <circle cx="97.5" cy="168.87" r="21" fill="#85B7EB"/>
+    <circle r="48" fill="#FFFFFF"/>
+  </g>
+</svg>