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/router/index.ts

@@ -17,10 +17,10 @@ const router = createRouter({
       meta: { requiresAuth: true },
     },
     {
-      path: '/shared',
-      name: 'shared',
-      component: () => import('@/views/SharedView.vue'),
-      meta: { requiresAuth: true },
+      path: '/upload',
+      name: 'upload',
+      component: () => import('@/views/UploadView.vue'),
+      meta: { requiresAuth: true, hideNav: true },
     },
     {
       path: '/settings',
@@ -28,6 +28,11 @@ const router = createRouter({
       component: () => import('@/views/SettingsView.vue'),
       meta: { requiresAuth: true },
     },
+    // Redirect old /shared to library shared tab
+    {
+      path: '/shared',
+      redirect: '/library?tab=shared',
+    },
     {
       path: '/:pathMatch(.*)*',
       redirect: '/',