Merge Bitcoin categories into one; rename Self-Hosted Apps to Personal Apps

- One "Bitcoin" category: the service catalog distinguishes bitcoin-base
  from bitcoin-apps, which surfaced as two sidebar menus and two tile
  sections. The Hub now normalizes both into a single "Bitcoin" category
  (nav item with combined count, one tile section). CATEGORY_ALIASES in
  constants.js maps the catalog keys; server config sends one
  ("bitcoin", "Bitcoin") entry and the node role allowlist is updated
  to match. The nix catalog is unchanged.
- "Self-Hosted Apps" is now "Personal Apps" — every service here is
  self-hosted, so the label added no distinction.

app/sovran_systemsos_web/static/js/constants.js

@@ -23,13 +23,19 @@ const SUPPORT_TIMER_INTERVAL    = 1000;
 
 const CATEGORY_ORDER = [
   "infrastructure",
-  "bitcoin-base",
-  "bitcoin-apps",
+  "bitcoin",
   "communication",
   "apps",
   "nostr",
 ];
 
+/* The service catalog still distinguishes the Bitcoin foundation services
+   from the Bitcoin apps; the Hub shows them as one "Bitcoin" section. */
+const CATEGORY_ALIASES = {
+  "bitcoin-base": "bitcoin",
+  "bitcoin-apps": "bitcoin",
+};
+
 const FEATURE_SUBCATEGORY_LABELS = {
   "infrastructure": "🔧 Infrastructure",
   "bitcoin":        "₿ Bitcoin",