dashcamd v2: native C++ process with direct camera capture

- New dashcamd: connects to camerad via VisionIPC, feeds raw NV12
  frames directly to OMX H.264 encoder. Full 1928x1208 resolution,
  4Mbps, 3-minute MP4 segments. Works regardless of UI state.
- Added encode_frame_nv12() to OmxEncoder — skips RGBA->NV12 conversion
- Suspends recording after 10 minutes of standstill
- Disabled old screen recorder timer in onroad.cc
- Suppress debug button alert (clpDebug event still fires for screen toggle)
- launch_openpilot.sh self-cleans other instances before starting
- Register DashcamDebug param in params.cc and manager.py
- Add dashcamd to build system (SConscript) and process_config
- Updated CLAUDE.md with all session changes
- Added GOALS.md feature roadmap

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

selfdrive/ui/qt/onroad.cc

@@ -919,14 +919,14 @@ void AnnotatedCameraWidget::initializeFrogPilotWidgets() {
     animationFrameIndex = (animationFrameIndex + 1) % totalFrames;
   });
 
-  // CLEARPILOT: screen recorder timer — feeds frames to the OMX encoder
-  QTimer *record_timer = new QTimer(this);
-  connect(record_timer, &QTimer::timeout, this, [this]() {
-    if (recorder_btn) {
-      recorder_btn->update_screen();
-    }
-  });
-  record_timer->start(1000 / UI_FREQ);
+  // CLEARPILOT: screen recorder disabled — replaced by dedicated dashcamd process
+  // QTimer *record_timer = new QTimer(this);
+  // connect(record_timer, &QTimer::timeout, this, [this]() {
+  //   if (recorder_btn) {
+  //     recorder_btn->update_screen();
+  //   }
+  // });
+  // record_timer->start(1000 / UI_FREQ);
 }
 
 void AnnotatedCameraWidget::updateFrogPilotWidgets() {