Support LOG_LEVEL environment variable

[bplatz]

Summary

Adds LOG_LEVEL environment variable support to logback configuration files for runtime log level control.

Changes

• Added LOG_LEVEL property with INFO default fallback
• Applied to all logger levels (root, fluree.server, fluree.db, fluree.db.consensus, fluree.db.messaging)
• Updated both dev/logback.xml and resources/logback.xml

Usage

# Set log level via environment variable
export LOG_LEVEL=DEBUG
java -jar target/server-*.jar

# Or inline
LOG_LEVEL=TRACE java -jar target/server-*.jar

Valid levels: TRACE, DEBUG, INFO, WARN, ERROR

Backward Compatibility

✅ Defaults to INFO if LOG_LEVEL not set - no behavior change for existing deployments

[zonotope]

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