feat: add a platform-aware apps download page

Serve desktop and Android builds from the latest Gitea release on /download, and fix the desktop compile and CI flakes that blocked v1.3.0.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/i18n/locales/en/auth.json

@@ -22,17 +22,41 @@
     "logout": "Sign out"
   },
   "app": {
-    "link": "Android app",
-    "title": "pipu for Android",
-    "subtitle": "Your music from this server on your phone: My Wave, your collection and offline listening.",
-    "download": "Download APK",
+    "link": "Download apps",
+    "badge": "Apps",
+    "title": "pipu on your devices",
+    "subtitle": "Clients for this server: phone, desktop and the web. The build for your system comes first.",
+    "platform": {
+      "android": "Android",
+      "windows": "Windows",
+      "linux": "Linux",
+      "macos": "macOS"
+    },
+    "download": {
+      "android": "Download APK",
+      "windows": "Download for Windows",
+      "linux": "Download AppImage",
+      "macos": "Download for macOS"
+    },
     "version": "version {{version}}",
-    "step_install": "Open the downloaded file. If Android asks, allow installs from this source.",
+    "other": "Other platforms",
+    "step_install": {
+      "android": "Open the downloaded file. If Android asks, allow installs from this source.",
+      "windows": "Run the installer and follow the steps. pipu will appear in the Start menu.",
+      "linux": "Make the file executable and open it. For a .deb, install the package.",
+      "macos": "Open the disk image and drag pipu into Applications."
+    },
     "step_server": "Launch pipu and enter the server address:",
     "copy_server": "Copy the server address",
-    "step_updates": "Sign in with your account. The app offers new versions by itself.",
+    "step_updates": {
+      "android": "Sign in with your account. The app offers new versions by itself.",
+      "windows": "Sign in with your account. Get a new version from this page.",
+      "linux": "Sign in with your account. Get a new version from this page.",
+      "macos": "Sign in with your account. Get a new version from this page."
+    },
     "checksum": "SHA-256 checksum",
-    "unavailable": "The app is not available yet: release downloads are not configured on this server (docs/deployment.md).",
+    "unavailable": "Apps are not available yet: release downloads are not configured on this server (docs/deployment.md).",
+    "unavailable_platform": "The latest release does not include a build for {{platform}} yet.",
     "to_login": "Sign in to the web app"
   }
 }