fix: fan 100% on overheat, FCW fps-aware, commIssue suppress, 10min shutdown

- Fan controller: allow full 100% fan when offroad temp >= 75°C (startup cooling)
- ModelFps memory param: modeld publishes actual FPS (20 or 4) so downstream
  consumers can adjust frame-rate-dependent logic
- Longitudinal planner: dynamically adjusts dt and v_desired_filter based on
  ModelFps; FCW crash_cnt threshold scales with FPS to maintain consistent
  0.15s trigger window at both 20fps and 4fps
- controlsd: suppress commIssue alerts for 2s after lateral control engages
  (FPS transition from 4->20 causes transient freq check failures)
- Shutdown timer: hardcoded to 10 minutes (was 45min via FrogPilot param),
  screen taps reset the countdown via ShutdownTouchReset memory param,
  removed Shutdown Timer UI selector from ClearPilot menu

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

selfdrive/modeld/modeld.py

@@ -275,6 +275,8 @@ def main(demo=False):
     # Skip 4 out of every 5 frames (20fps -> 4fps)
     # Write standby timestamp so controlsd suppresses transient errors
     if not full_rate:
+      if params_memory.get("ModelFps") != b"4":
+        params_memory.put("ModelFps", "4")
       now = _time.monotonic()
       if now - last_standby_ts_write > 1.0:
         params_memory.put("ModelStandbyTs", str(now))
@@ -283,6 +285,9 @@ def main(demo=False):
         last_vipc_frame_id = meta_main.frame_id
         run_count += 1
         continue
+    else:
+      if params_memory.get("ModelFps") != b"20":
+        params_memory.put("ModelFps", "20")
 
     desire = DH.desire
     is_rhd = sm["driverMonitoringState"].isRHD