Replace slf4j-log4j12 with slf4j-simple for tests (issue #8)

slf4j-log4j12 bridges to end-of-life Log4J 1.x. Replace it with
slf4j-simple, a lightweight zero-dependency backend suitable for
test logging. Remove log4j.properties and add simplelogger.properties.

https://claude.ai/code/session_01KxvyXRVVZaLrgTZshvsZY6

Author: claude

pom.xml

@@ -71,7 +71,7 @@
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
-      <artifactId>slf4j-log4j12</artifactId>
+      <artifactId>slf4j-simple</artifactId>
       <version>1.7.36</version>
       <scope>test</scope>
     </dependency>

src/test/resources/log4j.properties

@@ -0,0 +1,6 @@
+org.slf4j.simpleLogger.defaultLogLevel=debug
+org.slf4j.simpleLogger.log.org.apache.http=info
+org.slf4j.simpleLogger.showDateTime=true
+org.slf4j.simpleLogger.dateTimeFormat=yyyy-MM-dd HH:mm:ss,SSS
+org.slf4j.simpleLogger.showThreadName=true
+org.slf4j.simpleLogger.showShortLogName=true