spirekeeper: add v0.1.2 (unpaired-machine npub guards — fixes platform-fee 500 + cassette-consumer crash)

New entry alongside v0.1.1. Fixes the regression where an unpaired machine
(machine_npub NULL, nullable since #29) crashed normalize_public_key(None):
platform-fee update 500 + cassette consumer error-spam. See spirekeeper#33.
Demo upgrades v0.1.1 -> v0.1.2 to clear it (restart lnbits + hard-refresh).

extensions.json

@@ -65,6 +65,16 @@
             "archive": "https://git.atitlan.io/aiolabs/spirekeeper/archive/v0.1.1.zip",
             "hash": "766685fda379c3028e3d67aea80b7228374194a55e93b93f01d37c8fad973660"
         },
+        {
+            "id": "spirekeeper",
+            "repo": "https://git.atitlan.io/aiolabs/spirekeeper",
+            "name": "spirekeeper",
+            "version": "0.1.2",
+            "short_description": "Operator admin for bitSpire ATMs — DCA distribution over Nostr",
+            "icon": "https://git.atitlan.io/aiolabs/spirekeeper/raw/branch/main/static/image/aio.png",
+            "archive": "https://git.atitlan.io/aiolabs/spirekeeper/archive/v0.1.2.zip",
+            "hash": "31c657cf300c229ffc125affd9a582ca140fca920e9c1721764280e3629e9fc1"
+        },
         {
             "id": "events",
             "repo": "https://git.atitlan.io/aiolabs/events",