refactor(threads): migrate APRSRegistryThread to Event-based timing

- Set self.period=CONF.aprs_registry.frequency_seconds in __init__
- Remove counter-based conditional (loop every N seconds pattern)
- Replace time.sleep(1) with self.wait()
- Remove _loop_cnt tracking (use inherited loop_count from base)
- Remove unused time import

aprsd/threads/registry.py

@@ -1,5 +1,4 @@
 import logging
-import time
 
 import requests
 from oslo_config import cfg
@@ -14,11 +13,9 @@ LOG = logging.getLogger('APRSD')
 class APRSRegistryThread(aprsd_threads.APRSDThread):
     """This sends service information to the configured APRS Registry."""
 
-    _loop_cnt: int = 1
-
     def __init__(self):
         super().__init__('APRSRegistryThread')
-        self._loop_cnt = 1
+        self.period = CONF.aprs_registry.frequency_seconds
         if not CONF.aprs_registry.enabled:
             LOG.error(
                 'APRS Registry is not enabled.  ',
@@ -34,24 +31,21 @@ class APRSRegistryThread(aprsd_threads.APRSDThread):
         )
 
     def loop(self):
-        # Only call the registry every N seconds
-        if self._loop_cnt % CONF.aprs_registry.frequency_seconds == 0:
-            info = {
-                'callsign': CONF.callsign,
-                'owner_callsign': CONF.owner_callsign,
-                'description': CONF.aprs_registry.description,
-                'service_website': CONF.aprs_registry.service_website,
-                'software': f'APRSD version {aprsd.__version__} '
-                'https://github.com/craigerl/aprsd',
-            }
-            try:
-                requests.post(
-                    f'{CONF.aprs_registry.registry_url}',
-                    json=info,
-                )
-            except Exception as e:
-                LOG.error(f'Failed to send registry info: {e}')
+        info = {
+            'callsign': CONF.callsign,
+            'owner_callsign': CONF.owner_callsign,
+            'description': CONF.aprs_registry.description,
+            'service_website': CONF.aprs_registry.service_website,
+            'software': f'APRSD version {aprsd.__version__} '
+            'https://github.com/craigerl/aprsd',
+        }
+        try:
+            requests.post(
+                f'{CONF.aprs_registry.registry_url}',
+                json=info,
+            )
+        except Exception as e:
+            LOG.error(f'Failed to send registry info: {e}')
 
-        time.sleep(1)
-        self._loop_cnt += 1
+        self.wait()
         return True