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.initfs.d/10_inputd.service

@@ -3,4 +3,4 @@ description = "VT input and graphics multiplexer"
 
 [service]
 cmd = "inputd"
-type = { scheme = "input" }
+type = "oneshot_async"

init.initfs.d/10_lived.service

@@ -4,4 +4,4 @@ description = "Live disk"
 
 [service]
 cmd = "lived"
-type = "notify"
+type = "oneshot_async"

init.initfs.d/20_fbbootlogd.service

@@ -4,4 +4,4 @@ requires_weak = ["10_inputd.service", "20_vesad.service"]
 
 [service]
 cmd = "fbbootlogd"
-type = { scheme = "fbbootlog" }
+type = "oneshot_async"

init.initfs.d/20_fbcond.service

@@ -5,4 +5,4 @@ requires_weak = ["10_inputd.service", "20_vesad.service"]
 [service]
 cmd = "fbcond"
 args = ["2"]
-type = { scheme = "fbcon" }
+type = "oneshot_async"

init.initfs.d/20_vesad.service

@@ -10,4 +10,4 @@ inherit_envs = [
     "FRAMEBUFFER_HEIGHT",
     "FRAMEBUFFER_STRIDE",
 ]
-type = "notify"
+type = "oneshot_async"

init.initfs.d/40_bcm2835-sdhcid.service

@@ -6,4 +6,4 @@ condition_board = ["raspi3bp"]
 
 [service]
 cmd = "bcm2835-sdhcid"
-type = "notify"
+type = "oneshot_async"

init.initfs.d/40_hwd.service

@@ -5,4 +5,4 @@ requires_weak = ["10_inputd.service", "10_lived.service", "20_graphics.target"]
 [service]
 cmd = "hwd"
 inherit_envs = ["RSDP_ADDR", "RSDP_SIZE"]
-type = "notify"
+type = "oneshot_async"

init.initfs.d/40_ps2d.service

@@ -5,4 +5,4 @@ condition_architecture = ["x86", "x86_64"]
 
 [service]
 cmd = "ps2d"
-type = "notify"
+type = "oneshot_async"