feat(warehouse): P1 dashboard analytics — dwell/aging, cycle-time + on-time, live deltas

Adds the operational-performance layer to the warehouse cockpit:

- Dwell time & aging: dwellStats() (avg + 0-3/4-7/8-14/15+ buckets over
  in-warehouse items) → DwellAgingCard histogram.
- Cycle time & on-time: cycleStats() (arrived→ready→loaded→dispatched stage
  averages + dock-to-dispatch) and onTimeDispatchStats() (share of items that
  left before their storage free-days expired, resolved via the fee engine's
  own rule matching) → CycleTimeCard.
- Live tiles: opsStats() now returns receivedYesterday; KpiStrip renders an
  optional ▲/▼ delta, and the ops strip shows received-today vs yesterday.

New endpoints: GET /warehouse-inventory/{dwell-stats,cycle-stats} and
/warehouse-fees/on-time-dispatch (all guarded). New "Performance" section on
WarehouseDashboardPage. On-time reads N/A when there is no sample / no active
storage rule.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/edr-freight-web/backoffice/src/components/page/KpiStrip.tsx

@@ -17,6 +17,11 @@ export interface KpiItem {
    * into semantic tints.
    */
   color?: string;
+  /**
+   * Optional change vs a prior period, rendered as a ▲/▼ chip next to the value
+   * (green up, red down, muted zero). E.g. today's count minus yesterday's.
+   */
+  delta?: number;
 }
 
 export interface KpiStripProps {
@@ -67,16 +72,30 @@ export function KpiStrip({ items, loading = false }: KpiStripProps) {
                 {loading ? (
                   <Skeleton height={26} width={72} radius="sm" my={2} />
                 ) : (
-                  <Text
-                    fw={800}
-                    fz={24}
-                    lh={1.05}
-                    c="edr-text"
-                    style={{ letterSpacing: "-0.02em" }}
-                    truncate
-                  >
-                    {item.value}
-                  </Text>
+                  <div className="flex items-baseline gap-2">
+                    <Text
+                      fw={800}
+                      fz={24}
+                      lh={1.05}
+                      c="edr-text"
+                      style={{ letterSpacing: "-0.02em" }}
+                      truncate
+                    >
+                      {item.value}
+                    </Text>
+                    {item.delta != null && item.delta !== 0 ? (
+                      <Text
+                        component="span"
+                        fz="xs"
+                        fw={700}
+                        c={item.delta > 0 ? "edr-green" : "red"}
+                        style={{ whiteSpace: "nowrap" }}
+                      >
+                        {item.delta > 0 ? "▲" : "▼"}
+                        {Math.abs(item.delta)}
+                      </Text>
+                    ) : null}
+                  </div>
                 )}
                 <Text size="xs" fw={600} c="edr-muted" truncate>
                   {item.label}