docs: restructure framework, extract app execution module, group event collection & align GPIOs

.xagent/graph.json

@@ -78,6 +78,13 @@
       ],
       "lock": null
     },
+    "Docs/50_module-breakdown/mod-app.md": {
+      "depends_on": [
+        "Docs/30_architecture/main.md",
+        "Docs/40_ui-design/main.md"
+      ],
+      "lock": null
+    },
     "Docs/60_coding/mod-sys.md": {
       "depends_on": [
         "Docs/50_module-breakdown/mod-sys.md"
@@ -126,6 +133,12 @@
       ],
       "lock": null
     },
+    "Docs/60_coding/mod-app.md": {
+      "depends_on": [
+        "Docs/50_module-breakdown/mod-app.md"
+      ],
+      "lock": null
+    },
     "App/main.c": {
       "depends_on": [
         "Docs/60_coding/mod-sys.md",
@@ -133,7 +146,8 @@
         "Docs/60_coding/mod-power.md",
         "Docs/60_coding/mod-led.md",
         "Docs/60_coding/mod-motor.md",
-        "Docs/60_coding/mod-event.md"
+        "Docs/60_coding/mod-event.md",
+        "Docs/60_coding/mod-app.md"
       ],
       "lock": null
     },