Complete device management CRUD

[srgvg]

Context

devices.ts has 6 of 8 functions used (75%), but the core CRUD operations for individual devices are missing from the UI. The device list and discovery work, but create/update/delete for individual devices are not wired up.

API Functions to Wire Up

• getDevice - Get single device details (for detail page)
• createDevice - Manually add a device
• updateDevice - Update device properties
• deleteDevice - Remove a device

Affected Files

• ui/src/api/devices.ts - API module (8 functions defined, 6 used)
• ui/src/stores/devices.ts - Pinia store
• ui/src/pages/DevicesPage.vue
• ui/src/pages/DeviceDetailPage.vue

Acceptance Criteria

• Device detail page loads individual device data via getDevice
• Manual device creation form works
• Device property editing works with save
• Device deletion with confirmation dialog
• Device list refreshes after CRUD operations
• Error handling for all operations