[P] Move diagrams into a dedicated directory

diagrams/sequence.puml

@@ -0,0 +1,30 @@
+@startuml
+participant Agent as agent
+participant "MQTT Broker (raw\ntopic)" as mqtt1
+participant "Edge Service" as edge
+participant "MQTT\nBroker (processed\ntopic)" as mqtt2
+participant "Hub Service" as hub
+participant "Redis" as redis
+participant "Store API" as store
+participant "PostgreSQL" as db
+participant "MapView Client" as mapview
+
+agent -> mqtt1 : Publish raw\ntelemetry
+mqtt1 -> edge : Deliver raw\nmessage
+edge -> edge : Validate\nAgentData
+edge -> edge : Process\ntelemetry
+edge -> mqtt2 : Publish\nprocessed data
+mqtt2 -> hub : Deliver processed\nmessage
+hub -> hub : Validate\nProcessedAgentData
+hub -> redis : LPUSH to buffer
+hub -> redis : LPOP batch item
+redis -> hub : Return item
+hub -> store : POST batch
+store -> db : INSERT records
+db --> store : Return created\nrecords
+store -> mapview : WebSocket push
+mapview -> mapview : Sort by timestamp
+mapview -> mapview : Update vehicle\nmarker
+mapview -> mapview : Add pothole/bump\nmarker
+store --> hub : Success response
+@enduml