Add new pattern 'alternating_pulse' (ap): odd beat pulses color1 on odd bars, even beat pulses color2 on even bars; preserve existing alternating_phase; compact payloads and white guard retained

lighting_config.json

@@ -42,8 +42,8 @@
     }
   ],
   "selected_color_indices": [
-    5,
-    2
+    4,
+    3
   ],
   "pattern_parameters": {
     "alternating": {
@@ -136,6 +136,13 @@
       "n2": 10,
       "n3": 1,
       "n4": 1
+    },
+    "alternating_pulse": {
+      "delay": 100,
+      "n1": 10,
+      "n2": 10,
+      "n3": 1,
+      "n4": 1
     }
   }
 }