flake: add android-tools (adb) to devShell; justfile adb uses the devShell

adb is now provided by the flake's devShell (pinned to the flake's nixpkgs)
instead of an ad-hoc 'nix shell nixpkgs#android-tools' registry reference, so
the install/tv-* recipes use the same pinned adb as 'nix develop'.

flake.nix

@@ -58,6 +58,9 @@
               pkgs.jdk17
               pkgs.gradle
               androidSdk
+              # adb/fastboot — for sideloading the built APK to a device or an
+              # Android TV (Chromecast with Google TV) over the network.
+              pkgs.android-tools
             ];
 
             ANDROID_HOME = sdkRoot;

justfile

@@ -11,9 +11,10 @@
 pkg := ".?submodules=1#moonlight-android"
 build_flags := "--builders '' --print-build-logs"
 
-# adb from nixpkgs (no system install needed). The adb server daemon persists
-# between invocations, so `connect`/`pair` in one recipe line carries to the next.
-adb := "nix shell nixpkgs#android-tools --command adb"
+# adb from the flake devShell (android-tools, pinned to the flake's nixpkgs).
+# The adb server daemon persists between invocations, so `connect`/`pair` in
+# one recipe line carries to the next.
+adb := "nix develop '.?submodules=1' --command adb"
 
 # list available recipes
 default: