feat: add profile management page with full CRUD UI

- Add frontend API layer, Pinia store, and 5 components (ProfileCard, ProfilesPanel, ProfileCreateModal, ProfileRenameModal, ProfileImportModal)
- Add ProfilesView page with card grid layout and expandable details
- Modify export endpoint to stream file as browser download instead of returning server path
- Add sidebar nav entry, router route, and i18n translations (en/zh)
- Support create, rename, delete, switch (with gateway restart), export, and import profiles

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/client/src/i18n/locales/en.ts

@@ -31,6 +31,9 @@ export default {
     disable: 'Disable',
     configured: 'Configured',
     notConfigured: 'Not configured',
+    confirm: 'Confirm',
+    expand: 'Expand',
+    collapse: 'Collapse',
   },
 
   // Sidebar
@@ -38,6 +41,7 @@ export default {
     chat: 'Chat',
     jobs: 'Jobs',
     models: 'Models',
+    profiles: 'Profiles',
     skills: 'Skills',
     memory: 'Memory',
     logs: 'Logs',
@@ -197,6 +201,50 @@ export default {
     fetchFailed: 'Failed to fetch models',
   },
 
+  // Profiles
+  profiles: {
+    title: 'Profiles',
+    create: 'Create Profile',
+    import: 'Import',
+    export: 'Export',
+    rename: 'Rename',
+    delete: 'Delete',
+    switchTo: 'Switch to',
+    switchConfirm: 'Switching to profile "{name}" will restart the gateway. Continue?',
+    switchSuccess: 'Switched to profile "{name}"',
+    switchFailed: 'Failed to switch profile. Gateway may need manual restart.',
+    createSuccess: 'Profile "{name}" created',
+    createFailed: 'Failed to create profile',
+    renameSuccess: 'Profile renamed',
+    renameFailed: 'Failed to rename profile',
+    deleteConfirm: 'Are you sure you want to delete profile "{name}"?',
+    deleteSuccess: 'Profile deleted',
+    deleteFailed: 'Failed to delete profile',
+    exportSuccess: 'Profile exported',
+    exportFailed: 'Failed to export profile',
+    importSuccess: 'Profile imported',
+    importFailed: 'Failed to import profile',
+    name: 'Profile Name',
+    namePlaceholder: 'Enter profile name',
+    newName: 'New Name',
+    newNamePlaceholder: 'Enter new name',
+    cloneFromCurrent: 'Clone from current profile',
+    archivePath: 'Archive Path',
+    archivePathPlaceholder: 'Server path to archive file',
+    importName: 'Profile Name (optional)',
+    importNamePlaceholder: 'Leave empty to use archive name',
+    active: 'Active',
+    model: 'Model',
+    gateway: 'Gateway',
+    alias: 'Alias',
+    provider: 'Provider',
+    path: 'Path',
+    skills: 'Skills',
+    hasEnv: 'Has .env',
+    hasSoulMd: 'Has soul.md',
+    noProfiles: 'No profiles found. Create one to get started.',
+  },
+
   // Logs
   logs: {
     title: 'Logs',