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-table.tsx

@@ -82,7 +82,7 @@ const COLUMNS: ColumnDef[] = [
     id: "direction",
     label: "Dir.",
     tooltip:
-      "Direcție: Intrat = primit de la terți, Ieșit = trimis către terți",
+      "Direcție: Intrat = primit, Ieșit = trimis, Intern = intern",
     defaultVisible: true,
   },
   {
@@ -141,6 +141,7 @@ const STORAGE_KEY = "registratura:visible-columns";
 const DIRECTION_LABELS: Record<string, string> = {
   intrat: "Intrat",
   iesit: "Ieșit",
+  intern: "Intern",
 };
 
 function getDocTypeLabel(type: string): string {
@@ -152,6 +153,7 @@ function getDocTypeLabel(type: string): string {
 const STATUS_LABELS: Record<string, string> = {
   deschis: "Deschis",
   inchis: "Închis",
+  reserved: "Rezervat",
 };
 
 function loadVisibleColumns(): Set<ColumnId> {
@@ -327,7 +329,11 @@ export function RegistryTable({
                     <td className="px-3 py-2">
                       <Badge
                         variant={
-                          entry.direction === "intrat" ? "default" : "secondary"
+                          entry.direction === "intrat"
+                            ? "default"
+                            : entry.direction === "intern"
+                              ? "outline"
+                              : "secondary"
                         }
                         className="text-xs"
                       >
@@ -424,9 +430,16 @@ export function RegistryTable({
                     <td className="px-3 py-2">
                       <Badge
                         variant={
-                          entry.status === "deschis" ? "default" : "outline"
+                          entry.status === "deschis"
+                            ? "default"
+                            : entry.status === "reserved"
+                              ? "secondary"
+                              : "outline"
                         }
-                        className="text-xs"
+                        className={cn(
+                          "text-xs",
+                          entry.status === "reserved" && "border-dashed",
+                        )}
                       >
                         {STATUS_LABELS[entry.status]}
                       </Badge>