Organize configuration documentation in English

[Copilot]

The configuration docs lacked detail on Debezium engine properties and had structural issues with section hierarchy.

Changes

docs/configuration.md

• Expanded Debezium Engine Source section — replaced 3 generic rows with 5 organized sub-tables:
  • Core keys (debezium.name, debezium.connector.class, debezium.topic.prefix, debezium.provide.transaction.metadata)
  • Offset storage (debezium.offset.storage, .file.filename, .flush.interval.ms)
  • Schema history (debezium.schema.history.internal, .file.filename)
  • Database connection — PostgreSQL example (hostname, port, user, password, dbname, plugin name, schema list, snapshot mode)
  • Converters and transforms (debezium.key.converter, debezium.value.converter, debezium.transforms.*)
• Fixed section hierarchy — "Reserved Configuration" and "Monitoring and Metrics" were bold inline text nested inside Kafka Source; promoted to proper ### sections at the correct document level

docs/usage.md

• Added a JVM Configuration note explaining conf/jvm.conf and its defaults (8 GB min / 60 GB max heap, G1GC)

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