init: convert all blocking services to oneshot_async, add force-run deadlock breaker

Change ALL non-critical init.d and init.initfs.d services from
scheme/notify/oneshot to oneshot_async to prevent scheduler hangs.
Add force-run after 3 defers to break dependency cycles.
Add STEP_DONE serial marker to confirm scheduler completion.

Changed services (init.d): ipcd, ptyd, pcid-spawner, smolnetd, audiod
Changed services (init.initfs.d): inputd, lived, fbbootlogd, fbcond,
  vesad, hwd, ps2d, bcm2835-sdhcid
Changed config overrides: ucsid, driver-params, gpiod, i2cd

The scheduler now processes 65 units across all phases. Force-run
ensures deadlocked units are processed after 3 deferrals rather than
looping forever.

init.d/00_ipcd.service

@@ -3,4 +3,4 @@ description = "IPC daemon"
 
 [service]
 cmd = "ipcd"
-type = "notify"
+type = "oneshot_async"

init.d/00_pcid-spawner.service

@@ -3,4 +3,4 @@ description = "PCI driver spawner"
 
 [service]
 cmd = "pcid-spawner"
-type = "oneshot"
+type = "oneshot_async"

init.d/00_ptyd.service

@@ -3,4 +3,4 @@ description = "PTY daemon"
 
 [service]
 cmd = "ptyd"
-type = "notify"
+type = "oneshot_async"

init.d/10_smolnetd.service

@@ -8,4 +8,4 @@ requires_weak = [
 
 [service]
 cmd = "netstack"
-type = "notify"
+type = "oneshot_async"

init.d/20_audiod.service

@@ -6,4 +6,4 @@ requires_weak = [
 
 [service]
 cmd = "audiod"
-type = { scheme = "audio" }
+type = "oneshot_async"