Fix/gamelauncher nixos build (#225)

* game-launcher: bundle self-contained SQLite reader, drop libsqlite3 dependency

Fixes building gamelauncher.c on NixOS where the runtime env lacks
sqlite3.h/libsqlite3. scan_lutris now reads Lutris' pga.db through a
bundled read-only SQLite file parser instead of linking sqlite3.

* game-launcher: rework /g provider to reuse panel scan results

The launcher provider now reads the games the panel already scanned via
state/cache, trims the query, and surfaces status/error rows instead of
duplicating the scan.

---------

Co-authored-by: Ahmed5Emad <ahmed5emad@users.noreply.github.com>

game-launcher/plugin.toml

@@ -1,12 +1,12 @@
 id = "alexander/game-launcher"
 name = "Game Launcher"
-version = "1.1.2"
+version = "1.3.0"
 plugin_api = 13
 author = "Alexander"
 license = "MIT"
 icon = "device-gamepad-2"
 description = "Browse and launch games from Steam, Lutris, and Heroic."
-dependencies = ["cc", "libsqlite3-dev", "xdg-utils"]
+dependencies = ["cc", "xdg-utils"]
 tags = ["gaming", "launcher", "utility"]
 
 [[widget]]