feat(registratura): atomic numbering, reserved slots, audit trail, API endpoints + theme toggle animation

Registratura module:
- Atomic sequence numbering (BTG-2026-IN-00125 format) via PostgreSQL upsert
- Reserved monthly slots (2/company/month) for late registrations
- Append-only audit trail with diff tracking
- REST API: /api/registratura (CRUD), /api/registratura/reserved, /api/registratura/audit
- Auth: NextAuth session + Bearer API key support
- New "intern" direction type with UI support (form, filters, table, detail panel)
- Prisma models: RegistrySequence, RegistryAudit

Theme toggle:
- SVG mask-based sun/moon morph with 360° spin animation
- Inverted logic (sun in dark mode, moon in light mode)

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

src/modules/registratura/components/registry-entry-detail.tsx

@@ -2,6 +2,7 @@
 
 import {
   ArrowDownToLine,
+  ArrowRightLeft,
   ArrowUpFromLine,
   Calendar,
   CheckCircle2,
@@ -64,6 +65,12 @@ const DIRECTION_CONFIG = {
     class:
       "bg-orange-100 text-orange-800 dark:bg-orange-900/40 dark:text-orange-300",
   },
+  intern: {
+    label: "Intern",
+    icon: ArrowRightLeft,
+    class:
+      "bg-purple-100 text-purple-800 dark:bg-purple-900/40 dark:text-purple-300",
+  },
 } as const;
 
 const STATUS_CONFIG = {
@@ -76,6 +83,10 @@ const STATUS_CONFIG = {
     label: "Închis",
     class: "bg-gray-100 text-gray-600 dark:bg-gray-800 dark:text-gray-400",
   },
+  reserved: {
+    label: "Rezervat",
+    class: "bg-amber-100 text-amber-800 dark:bg-amber-900/40 dark:text-amber-300",
+  },
 } as const;
 
 const RESOLUTION_LABELS: Record<string, string> = {