ui(deploy): strategy hint on Resources tab + indicator on StatusCard

Resources tab: add a hint under the Deploy Strategy dropdown that
explains the blue-green vs rolling trade-off (resource peak, failure
semantics), switching text based on the current selection.

StatusCard: show the active deployment's strategy inline in the info
grid so users can tell at a glance which path was taken for a given
deployment.

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

ui/src/pages/AppsTab/AppDeploymentPage/ConfigTabs/ResourcesTab.tsx

@@ -172,15 +172,22 @@ export function ResourcesTab({ value, onChange, disabled, isProd = false }: Prop
       />
 
       <span className={styles.configLabel}>Deploy Strategy</span>
-      <Select
-        disabled={disabled}
-        value={value.deployStrategy}
-        onChange={(e) => update('deployStrategy', e.target.value)}
-        options={[
-          { value: 'blue-green', label: 'Blue/Green' },
-          { value: 'rolling', label: 'Rolling' },
-        ]}
-      />
+      <div>
+        <Select
+          disabled={disabled}
+          value={value.deployStrategy}
+          onChange={(e) => update('deployStrategy', e.target.value)}
+          options={[
+            { value: 'blue-green', label: 'Blue/Green' },
+            { value: 'rolling', label: 'Rolling' },
+          ]}
+        />
+        <span className={styles.configHint}>
+          {value.deployStrategy === 'rolling'
+            ? 'Replace one replica at a time; peak = replicas + 1. Partial failure leaves remaining old replicas serving.'
+            : 'Start all new replicas, swap once all are healthy; peak = 2 × replicas. Partial failure preserves the previous deployment.'}
+        </span>
+      </div>
 
       <span className={styles.configLabel}>Strip Path Prefix</span>
       <div className={styles.configInline}>