Feature: Multi-email alerts and move resource between groups

- notificationService: Parse comma-separated emails from resource.email_to or global config; validate and send to each recipient
- API: Add PATCH /api/resources/:id/group endpoint to move resource between groups with validation and cache invalidation
- UI: Add group selector to edit modal; wire group change to PATCH endpoint; add help text for multi-email format

client/build/static/js/main.b7b055d1.js.LICENSE.txt

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+/*! decimal.js-light v2.5.1 https://github.com/MikeMcl/decimal.js-light/LICENCE */
+
+/**
+ * @license React
+ * react-dom-client.production.js
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+/**
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+ * react-dom.production.js
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+/**
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+ * react.production.js
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+/**
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+ *
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+/**
+ * @license React
+ * use-sync-external-store-with-selector.production.js
+ *
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+
+/**
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+/** @license React v17.0.2
+ * react-is.production.min.js
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+ */