refactor: CPU config to millicores, fix replica health, reorder tabs

- Rename cpuShares to cpuRequest (millicores), cpuLimit from cores to
  millicores. ResolvedContainerConfig translates to Docker-native units
  via dockerCpuShares() and dockerCpuQuota() helpers. Future K8s
  orchestrator can pass millicores through directly.
- Fix waitForAnyHealthy to wait for ALL replicas instead of returning
  on first healthy one. Prevents false DEGRADED status with 2+ replicas.
- Default app detail to Configuration tab (was Overview)
- Reorder config sub-tabs: Monitoring, Resources, Variables, Traces &
  Taps, Route Recording

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/Admin/EnvironmentsPage.tsx

@@ -331,7 +331,7 @@ function DefaultResourcesSection({ environment, onSave, saving }: {
   const [editing, setEditing] = useState(false);
   const [memoryLimit, setMemoryLimit] = useState('');
   const [memoryReserve, setMemoryReserve] = useState('');
-  const [cpuShares, setCpuShares] = useState('');
+  const [cpuRequest, setCpuRequest] = useState('');
   const [cpuLimit, setCpuLimit] = useState('');
   const [routingMode, setRoutingMode] = useState(String(defaults.routingMode ?? 'path'));
   const [routingDomain, setRoutingDomain] = useState(String(defaults.routingDomain ?? ''));
@@ -341,7 +341,7 @@ function DefaultResourcesSection({ environment, onSave, saving }: {
   useEffect(() => {
     setMemoryLimit(String(defaults.memoryLimitMb ?? ''));
     setMemoryReserve(String(defaults.memoryReserveMb ?? ''));
-    setCpuShares(String(defaults.cpuShares ?? ''));
+    setCpuRequest(String(defaults.cpuRequest ?? ''));
     setCpuLimit(String(defaults.cpuLimit ?? ''));
     setRoutingMode(String(environment.defaultContainerConfig.routingMode ?? 'path'));
     setRoutingDomain(String(environment.defaultContainerConfig.routingDomain ?? ''));
@@ -353,7 +353,7 @@ function DefaultResourcesSection({ environment, onSave, saving }: {
   function handleCancel() {
     setMemoryLimit(String(defaults.memoryLimitMb ?? ''));
     setMemoryReserve(String(defaults.memoryReserveMb ?? ''));
-    setCpuShares(String(defaults.cpuShares ?? ''));
+    setCpuRequest(String(defaults.cpuRequest ?? ''));
     setCpuLimit(String(defaults.cpuLimit ?? ''));
     setRoutingMode(String(defaults.routingMode ?? 'path'));
     setRoutingDomain(String(defaults.routingDomain ?? ''));
@@ -366,8 +366,8 @@ function DefaultResourcesSection({ environment, onSave, saving }: {
     await onSave({
       memoryLimitMb: memoryLimit ? parseInt(memoryLimit) : null,
       memoryReserveMb: memoryReserve ? parseInt(memoryReserve) : null,
-      cpuShares: cpuShares ? parseInt(cpuShares) : null,
-      cpuLimit: cpuLimit ? parseFloat(cpuLimit) : null,
+      cpuRequest: cpuRequest ? parseInt(cpuRequest) : null,
+      cpuLimit: cpuLimit ? parseInt(cpuLimit) : null,
       routingMode,
       routingDomain: routingDomain || null,
       serverUrl: serverUrl || null,
@@ -393,15 +393,15 @@ function DefaultResourcesSection({ environment, onSave, saving }: {
           ? <Input value={memoryReserve} onChange={(e) => setMemoryReserve(e.target.value)} placeholder="e.g. 256" style={{ width: 100 }} />
           : <span className={styles.metaValue}>{defaults.memoryReserveMb ? `${defaults.memoryReserveMb} MB` : '—'}</span>}
 
-        <span className={styles.metaLabel}>CPU Shares</span>
+        <span className={styles.metaLabel}>CPU Request</span>
         {editing
-          ? <Input value={cpuShares} onChange={(e) => setCpuShares(e.target.value)} placeholder="e.g. 512" style={{ width: 100 }} />
-          : <span className={styles.metaValue}>{String(defaults.cpuShares ?? '—')}</span>}
+          ? <Input value={cpuRequest} onChange={(e) => setCpuRequest(e.target.value)} placeholder="e.g. 500" style={{ width: 100 }} />
+          : <span className={styles.metaValue}>{defaults.cpuRequest ? `${defaults.cpuRequest}m` : '—'}</span>}
 
         <span className={styles.metaLabel}>CPU Limit</span>
         {editing
-          ? <Input value={cpuLimit} onChange={(e) => setCpuLimit(e.target.value)} placeholder="e.g. 1.0" style={{ width: 100 }} />
-          : <span className={styles.metaValue}>{defaults.cpuLimit ? `${defaults.cpuLimit} cores` : '—'}</span>}
+          ? <Input value={cpuLimit} onChange={(e) => setCpuLimit(e.target.value)} placeholder="e.g. 1000" style={{ width: 100 }} />
+          : <span className={styles.metaValue}>{defaults.cpuLimit ? `${defaults.cpuLimit}m` : '—'}</span>}
 
         <span className={styles.metaLabel}>Routing Mode</span>
         {editing