feat: add MOONLOCK_DEBUG env var for debug-level logging (v0.6.1)

Align with moongreet/moonset logging pattern — set MOONLOCK_DEBUG to
enable debug-level journal output for troubleshooting.

CLAUDE.md

@@ -44,7 +44,7 @@ LD_PRELOAD=/usr/lib/libgtk4-layer-shell.so ./target/release/moonlock
 - `i18n.rs` — Locale-Erkennung (OnceLock-cached) und String-Tabellen (DE/EN), faillock_warning mit konfigurierbarem max_attempts
 - `config.rs` — TOML-Config (background_path, background_blur, fingerprint_enabled als Option<bool>) + Wallpaper-Fallback + Symlink-Rejection für background_path + Parse-Error-Logging
 - `lockscreen.rs` — GTK4 UI via LockscreenHandles, PAM-Auth via gio::spawn_blocking, FP-Label/Start separat verdrahtet, Zeroizing<String> für Passwort, Power-Confirm, GPU-Blur via GskBlurNode, Blur/Avatar-Cache für Multi-Monitor
-- `main.rs` — Entry Point, Panic-Hook (vor Logging), Root-Check, ext-session-lock-v1 (Pflicht in Release), Multi-Monitor mit shared Blur/Avatar-Caches, systemd-Journal-Logging, async fprintd-Init nach window.present()
+- `main.rs` — Entry Point, Panic-Hook (vor Logging), Root-Check, ext-session-lock-v1 (Pflicht in Release), Multi-Monitor mit shared Blur/Avatar-Caches, systemd-Journal-Logging, Debug-Level per `MOONLOCK_DEBUG` Env-Var, async fprintd-Init nach window.present()
 
 ## Sicherheit
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "moonlock"
-version = "0.6.0"
+version = "0.6.1"
 edition = "2024"
 description = "A secure Wayland lockscreen with GTK4, PAM and fingerprint support"
 license = "MIT"

src/main.rs

@@ -196,7 +196,12 @@ fn setup_logging() {
             eprintln!("Failed to create journal logger: {e}");
         }
     }
-    log::set_max_level(log::LevelFilter::Info);
+    let level = if std::env::var("MOONLOCK_DEBUG").is_ok() {
+        log::LevelFilter::Debug
+    } else {
+        log::LevelFilter::Info
+    };
+    log::set_max_level(level);
 }
 
 fn install_panic_hook() {