refactor: rename extension identity to spirekeeper

Fork of satmachineadmin's v2-bitspire line into its own repo. Renames
both identifiers so this extension is fully independent of the original
satmachineadmin install (which remains in service):

  - extension id   satmachineadmin -> spirekeeper
    (router prefix, static path/static_url_for, module symbols, task
     names, templates dir, config/manifest paths)
  - database name  satoshimachine  -> spirekeeper
    (Database(ext_spirekeeper), all schema-qualified table refs)

Also resets versioning to 0.1.0, sets the display name + manifest to
spirekeeper/aiolabs, and fixes the placeholder pyproject description.
Historical aiolabs/satmachineadmin#N issue references in comments are
left pointing at the original repo where those issues live.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

config.json

@@ -1,7 +1,7 @@
 {
-  "name": "DCA Admin",
+  "name": "spirekeeper",
   "short_description": "Dollar Cost Averaging administration for Lamassu ATM integration",
-  "tile": "/satmachineadmin/static/image/aio.png",
+  "tile": "/spirekeeper/static/image/aio.png",
   "min_lnbits_version": "1.0.0",
   "contributors": [
     {
@@ -26,7 +26,7 @@
     }
   ],
   "images": [],
-  "description_md": "/satmachineadmin/description.md",
-  "terms_and_conditions_md": "/satmachineadmin/toc.md",
+  "description_md": "/spirekeeper/description.md",
+  "terms_and_conditions_md": "/spirekeeper/toc.md",
   "license": "MIT"
 }