Harden onion boot flow and deepen site surfaces

Add persistent onion key backup and restore, improve startup resilience, and flesh out the major site verticals with richer navigation, search coverage, and operator documentation.

Made-with: Cursor

lib/cyberluxEntry.ts

@@ -0,0 +1,18 @@
+/** Mirrors nginx `X-Cyberlux-Node` — which .onion hostname the user entered on. */
+import {
+  CYBERLUX_ENTRY_VALUES,
+  type CyberluxEntry,
+} from "@/lib/onionRoutes.generated";
+
+export { CYBERLUX_ENTRY_VALUES, type CyberluxEntry };
+
+export const CYBERLUX_ENTRY_COOKIE = "cyberlux-entry";
+
+export function parseCyberluxEntry(
+  raw: string | undefined | null,
+): CyberluxEntry {
+  if (raw && (CYBERLUX_ENTRY_VALUES as readonly string[]).includes(raw)) {
+    return raw as CyberluxEntry;
+  }
+  return "hub";
+}