change(ps): emit flow in m³/h (canonical + output)

Switch pumpingStation flow unit from m³/s to m³/h for canonical and output
so telemetry/dashboard series land on the same axis as the rest of the
group. NOTE: diverges from the platform-wide m³/s canonical convention —
flagged for review.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/specificClass.js

@@ -24,9 +24,9 @@ class PumpingStation extends BaseDomain {
   // MeasurementContainer keeps the integrator's m³ unit on those streams
   // (FlowAggregator writes spill / underflow per tick).
   static unitPolicy = UnitPolicy.declare({
-    canonical: { flow: 'm3/s', pressure: 'Pa', power: 'W', temperature: 'K' },
+    canonical: { flow: 'm3/h', pressure: 'Pa', power: 'W', temperature: 'K' },
     output:    {
-      flow: 'm3/s', netFlowRate: 'm3/s', level: 'm', volume: 'm3',
+      flow: 'm3/h', netFlowRate: 'm3/h', level: 'm', volume: 'm3',
       overflowVolume: 'm3', underflowVolume: 'm3',
     },
     requireUnitForTypes: [],