Add ADS-B, AIS, and ALPR map layers with live CoT streaming (#36)

## Summary

- **ADS-B & AIS:** OpenSky and AISStream OSINT feeds upsert into the CoT store; tactical tracks still arrive via adsbcot/aiscot on `:8089`. Map clients subscribe via `GET /api/cot/stream` (SSE) with viewport bbox filtering and Air / Surface / Team layer toggles.
- **ALPR (Flock/OSM):** Toggleable license-plate reader layer sourced from OpenStreetMap, with SQLite cache, Overpass fallback, tiled viewport fetching, and clustered markers with direction cones.
- **Map performance:** Ring-based tile selection (fixes zoom-out crash), immutable tile cache, incremental marker sync, split cluster load/query, and padded SSE bbox to reduce reconnect churn.

## Docs

- `docs/tracking.md` — ADS-B/AIS accuracy tiers, freshness, self-hosted receivers, optional OSINT API keys
- `docs/map-and-cameras.md` — ALPR layer and map behavior updates

---------

Co-authored-by: Madison Grubb <madison@elastiflow.com>
Reviewed-on: #36

app/pages/index.vue

@@ -7,11 +7,23 @@
           :pois="pois ?? []"
           :live-sessions="liveSessions ?? []"
           :cot-entities="cotEntities ?? []"
+          :cot-layers="cotLayers"
+          :alpr-markers="showAlpr ? (alprMarkers ?? []) : []"
+          :show-alpr="showAlpr"
           :can-edit-pois="canEditPois"
           @select="selectedCamera = $event"
           @select-live="onSelectLive($event)"
           @refresh-pois="refreshPois"
+          @bounds-change="onMapBoundsChange"
+          @toggle-alpr="toggleAlpr"
+          @toggle-cot-layer="toggleLayer"
         />
+        <template #fallback>
+          <div
+            class="h-full min-h-[300px] bg-kestrel-bg"
+            aria-hidden="true"
+          />
+        </template>
       </ClientOnly>
     </div>
     <CameraViewer
@@ -23,11 +35,20 @@
 </template>
 
 <script setup>
-const { devices, liveSessions, cotEntities } = useCameras()
+const { devices, liveSessions } = useCameras()
 const { data: pois, refresh: refreshPois } = usePois()
 const { canEditPois } = useUser()
+const { showAlpr, toggleAlpr, alprMarkers, onBoundsChange: onAlprBoundsChange } = useAlprCameras()
+const { layers: cotLayers, layerQuery, toggleLayer } = useCotLayers()
+const mapBounds = ref(null)
+const { cotEntities } = useCotStream(mapBounds, layerQuery)
 const selectedCamera = ref(null)
 
+function onMapBoundsChange(bounds) {
+  mapBounds.value = bounds
+  onAlprBoundsChange(bounds)
+}
+
 function onSelectLive(session) {
   selectedCamera.value = (liveSessions.value ?? []).find(s => s.id === session?.id) ?? session
 }