Fix spontan doorbell efter HA genstart: restart-safe event_cnt

- input_number initial sat til -1 (sentinel for 'aldrig synkroniseret')
- condition fjernet, event_cnt check flyttet ind i action blok
- counter opdateres ALTID (ogsaa ved wake-up)
- doorbell koerer kun naar old_cnt >= 0 OG new_cnt != old_cnt
- foerste wake-up efter restart synkroniserer stille uden at ringe

include/input/number/shelly_buttons.yaml

@@ -0,0 +1,15 @@
+shelly_bagdor_event_cnt:
+  name: Shelly bagdoer event count
+  min: -1
+  max: 99999
+  step: 1
+  mode: box
+  initial: -1
+
+shelly_fordor_event_cnt:
+  name: Shelly fordoer event count
+  min: -1
+  max: 99999
+  step: 1
+  mode: box
+  initial: -1