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/dashboard.js

@@ -24,8 +24,7 @@
   var CAT_ICONS = {
     "all":            "g-grid",
     "infrastructure": "g-server",
-    "bitcoin-base":   "g-btc-sym",
-    "bitcoin-apps":   "g-btc-sym",
+    "bitcoin":        "g-btc-sym",
     "communication":  "g-chat",
     "apps":           "g-dots",
     "nostr":          "g-antenna",
@@ -34,8 +33,7 @@
 
   var CAT_FALLBACK_LABELS = {
     "infrastructure": "Infrastructure",
-    "bitcoin-base":   "Bitcoin",
-    "bitcoin-apps":   "Bitcoin Apps",
+    "bitcoin":        "Bitcoin",
     "communication":  "Communication",
     "apps":           "Personal Apps",
     "nostr":          "Nostr",
@@ -75,6 +73,7 @@
     var order = [];
     visibleServices().forEach(function (s) {
       var cat = s.category || "other";
+      if (CATEGORY_ALIASES[cat]) cat = CATEGORY_ALIASES[cat];
       if (!counts[cat]) { counts[cat] = 0; order.push(cat); }
       counts[cat]++;
     });