Add glossary terms for Redpanda SQL and Iceberg

modules/terms/partials/iceberg-catalog.adoc

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+=== Iceberg catalog
+:term-name: Iceberg catalog
+:hover-text: A metadata service that tracks Apache Iceberg tables and their schemas. Redpanda supports REST catalogs (such as AWS Glue, Snowflake Open Catalog, or Databricks Unity Catalog) and filesystem-based catalogs.
+:category: Redpanda core
+
+Redpanda SQL connects to a REST catalog with `CREATE ICEBERG CATALOG` to query the Iceberg-committed history of a topic.

modules/terms/partials/iceberg-mode.adoc

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+=== Iceberg mode
+:term-name: Iceberg mode
+:hover-text: The Redpanda topic property (`redpanda.iceberg.mode`) that controls whether and how the topic's records are translated into an Apache Iceberg table.
+:category: Redpanda core

modules/terms/partials/iceberg-topic.adoc

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+=== Iceberg topic
+:term-name: Iceberg topic
+:hover-text: A Redpanda topic with Iceberg integration enabled, so its data is also stored as an Apache Iceberg table that downstream analytical systems can read directly. Also called an Iceberg-enabled topic.
+:category: Redpanda core

modules/terms/partials/iceberg-translation.adoc

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+=== Iceberg translation
+:term-name: Iceberg translation
+:hover-text: The background process that converts records on an Iceberg topic into Apache Iceberg format and commits them to the configured Iceberg catalog.
+:category: Redpanda core

modules/terms/partials/oxla.adoc

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+=== Oxla
+:term-name: Oxla
+:hover-text: The SQL engine technology that powers Redpanda SQL. "Oxla" may appear in version strings, error messages, and some API field names.
+:category: Redpanda SQL

modules/terms/partials/redpanda-catalog.adoc

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+=== Redpanda catalog
+:term-name: Redpanda catalog
+:hover-text: A catalog in Redpanda SQL that maps Redpanda topics to SQL tables. The default Redpanda catalog (`default_redpanda_catalog`) is provisioned automatically when Redpanda SQL is enabled.
+:category: Redpanda SQL

modules/terms/partials/redpanda-sql.adoc

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+=== Redpanda SQL
+:term-name: Redpanda SQL
+:hover-text: A PostgreSQL-compatible SQL engine built into Redpanda Data Platform for querying streaming data in Redpanda topics.
+:category: Redpanda SQL
+
+Redpanda SQL provides analytical SQL queries over Redpanda topic data without requiring ETL pipelines or a separate analytics system. It can also query the Iceberg-translated history of Iceberg-enabled topics alongside live records.

modules/terms/partials/wire-format.adoc

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+=== wire format
+:term-name: wire format
+:hover-text: A serialization format used by Schema Registry that prefixes each record with a magic byte and 4-byte schema ID, so consumers can identify and apply the correct schema.
+:category: Redpanda core