fix: Core API health check path - use /api/v1/health for all cases

- Removed incorrect localhost conditional that used /health (404)
- Now uses /api/v1/health for both localhost and remote access
- Added console.error logging for debugging
- Aligns with Core API route design

src/views/AdminView.vue

@@ -935,16 +935,15 @@ async function testCoreApi() {
   testingCore.value = true
   coreInfo.value = null
   try {
-    const isLocalhost = coreApiUrl.value.includes('localhost') || coreApiUrl.value.includes('127.0.0.1')
-    // Localhost: direct /health path
-    // Remote: via reverse proxy at /api/v1/health
-    const healthUrl = isLocalhost ? `${coreApiUrl.value}/health` : `${coreApiUrl.value}/api/v1/health`
+    // Core API uses /api/v1/health for both localhost and remote access
+    const healthUrl = `${coreApiUrl.value}/api/v1/health`
     const resp = await fetch(healthUrl, { signal: AbortSignal.timeout(5000) })
     if (!resp.ok) throw new Error(`HTTP ${resp.status}`)
     const data = await resp.json()
     coreStatus.value = 'online'
     coreInfo.value = { version: data.version, uptime: data.uptime_ms }
   } catch (e: any) {
+    console.error('[testCoreApi] Failed:', e.message || e)
     coreStatus.value = 'offline'
     coreInfo.value = null
   } finally {