chore: stage all in-progress work before repo split

Web app: new entities (Image, RenderedAsset, SharedImage, Token,
DeviceImageHistory), enums, repositories, controllers, message handlers,
migrations, tests, frontend upload/library/sticker UI, Vue components.

Firmware: EPD background screen binaries + gen scripts, setup_bg header.

Infra: ddev config, test bundle, gitignore coverage dir.

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

frontend/src/stores/devices.ts

@@ -21,7 +21,7 @@ export const useDevicesStore = defineStore('devices', () => {
     }
   }
 
-  async function updateDevice(id: number, patch: Partial<Pick<Device, 'name' | 'orientation' | 'rotationIntervalHours' | 'uniquenessWindow'>>) {
+  async function updateDevice(id: number, patch: Partial<Pick<Device, 'name' | 'orientation' | 'rotationIntervalMinutes' | 'wakeHour' | 'timezone' | 'uniquenessWindow'>>) {
     const res = await fetch(`/api/devices/${id}`, {
       method: 'PATCH',
       headers: { 'Content-Type': 'application/json' },
@@ -34,5 +34,27 @@ export const useDevicesStore = defineStore('devices', () => {
     return updated
   }
 
-  return { devices, loading, error, fetchDevices, updateDevice }
+  async function lockImage(deviceId: number, imageId: number): Promise<Device> {
+    const res = await fetch(`/api/devices/${deviceId}/lock`, {
+      method: 'PUT',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ imageId }),
+    })
+    if (!res.ok) throw new Error('Failed to lock image')
+    const updated: Device = await res.json()
+    const idx = devices.value.findIndex(d => d.id === deviceId)
+    if (idx !== -1) devices.value[idx] = updated
+    return updated
+  }
+
+  async function unlockImage(deviceId: number): Promise<Device> {
+    const res = await fetch(`/api/devices/${deviceId}/lock`, { method: 'DELETE' })
+    if (!res.ok) throw new Error('Failed to unlock')
+    const updated: Device = await res.json()
+    const idx = devices.value.findIndex(d => d.id === deviceId)
+    if (idx !== -1) devices.value[idx] = updated
+    return updated
+  }
+
+  return { devices, loading, error, fetchDevices, updateDevice, lockImage, unlockImage }
 })