Propagate new fallback model to all remaining script references

All FALLBACK_${MY_ID}_COVERS_${REMOTE_ID}_TIER* references updated to
FALLBACK_${REMOTE_ID}_TIER* across fallback_test.sh, partnership_manager.sh,
docker_update.sh, mesh_monitor.sh, and monitor.php. mesh_monitor.sh drops
the inner covering-host loop — tier data now lives in the covered host's own
conf so no cross-host scan is needed. monitor.php reads from the covered
host's conf file rather than the local host's.

Fallback/fallback_test.sh

@@ -206,7 +206,7 @@ if [[ "$SHOW_STATUS" == true ]]; then
     fi
 
     # Show Tier 1 containers for this host
-    TIER1_VAR="FALLBACK_${MY_ID}_COVERS_${REMOTE_ID}_TIER1"
+    TIER1_VAR="FALLBACK_${REMOTE_ID}_TIER1"
     eval "TIER1_CONTAINERS=(\"\${${TIER1_VAR}[@]:-}\")"
     echo "$ICON_CONTAINERS Tier 1 to test: ${TIER1_CONTAINERS[*]:-none configured}"
     echo "━━━━━━━━━━━━━━━━━━━━━━━"
@@ -223,8 +223,8 @@ TOTAL_START=$(date +%s)
 phase_pass() { PHASES_PASS+=("$1"); warn "$ICON_DONE  Phase: $1 — PASSED ✅"; }
 phase_fail() { PHASES_FAIL+=("$1"); error "Phase: $1 — FAILED ❌"; }
 
-# Get Tier 1 containers for this server's fallback responsibility
-TIER1_VAR="FALLBACK_${MY_ID}_COVERS_${REMOTE_ID}_TIER1"
+# Get Tier 1 containers defined in remote's own conf
+TIER1_VAR="FALLBACK_${REMOTE_ID}_TIER1"
 eval "TIER1_CONTAINERS=(\"\${${TIER1_VAR}[@]:-}\")"
 
 # ==============================================================================================
@@ -286,7 +286,7 @@ fi
 # Tier 1 containers configured
 if [[ ${#TIER1_CONTAINERS[@]} -eq 0 ]]; then
     error "No Tier 1 containers configured for $MY_ID → $REMOTE_ID"
-    error "Check FALLBACK_${MY_ID}_COVERS_${REMOTE_ID}_TIER1 in host*.conf"
+    error "Check FALLBACK_${REMOTE_ID}_TIER1 in ${REMOTE_ID,,}.conf"
     phase_fail "Pre-flight"
     exit 1
 fi