docs(report): add section 5.3 draft assets

docs/temp-section-5-3-diagrams/5.3.7-motion-events-notifications-audit.md

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+# 5.3.7 Motion Events Notifications and Audit Trail
+
+## Motion Event Lifecycle
+
+```mermaid
+flowchart TD
+    Trigger[Manual trigger or browser motion detector]
+    Start[/POST /events/motion/start/]
+    Event[(events table)]
+    Links[(device_links)]
+    RT[Realtime motion:detected]
+    Push[Queued push notification]
+    End[/POST /events/:id/motion/end/]
+
+    Trigger --> Start
+    Start --> Event
+    Start --> Links
+    Links --> RT
+    Links --> Push
+    RT --> End
+    Push --> End
+    End --> Event
+```
+
+## Activity and Audit Flow
+
+```mermaid
+flowchart LR
+    Camera[Camera Device]
+    Event[(events)]
+    Notif[(notifications)]
+    Delivery[(notification_deliveries)]
+    Audit[(audit_logs)]
+    Client[Client Device]
+
+    Camera --> Event
+    Event --> Notif
+    Event --> Delivery
+    Event --> Audit
+    Notif --> Client
+    Delivery --> Client
+```