#89: Log-Datei landet im MSI-Betrieb verlaesslich auf der Platte

Log4j2 referenziert nun ${sys:log.directory} mit nutzerschreibbarem
Fallback (~/pdf-umbenenner/logs). Die System-Property wird vor dem
ersten Logger-Zugriff aus der aktiven Konfigurationsdatei gesetzt
(EarlyLogDirectoryInitializer), damit Log4j2 bereits bei der
Erstinitialisierung den korrekten Pfad kennt.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pdf-umbenenner-bootstrap/src/main/resources/log4j2.xml

@@ -6,9 +6,13 @@
             <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" charset="UTF-8"/>
         </Console>
 
-        <!-- Rolling file appender for logs in ./logs/ directory -->
-        <RollingFile name="File" fileName="logs/pdf-umbenenner.log"
-                     filePattern="logs/pdf-umbenenner-%d{yyyy-MM-dd}-%i.log.gz">
+        <!-- Rolling file appender. Honours the system property log.directory which
+             is set very early in the bootstrap from the active configuration file.
+             The fallback intentionally points to a guaranteed-writable user-scoped
+             directory so MSI installs (where the working directory typically lives
+             under Program Files and is not user-writable) still produce log files. -->
+        <RollingFile name="File" fileName="${sys:log.directory:-${sys:user.home}/pdf-umbenenner/logs}/pdf-umbenenner.log"
+                     filePattern="${sys:log.directory:-${sys:user.home}/pdf-umbenenner/logs}/pdf-umbenenner-%d{yyyy-MM-dd}-%i.log.gz">
             <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" charset="UTF-8"/>
             <Policies>
                 <TimeBasedTriggeringPolicy interval="1" modulate="true"/>