Docs: Add SeaweedFS REST catalog and FileIO configuration examples

[chrislusf]

Adds SeaweedFS to the configuration docs in two places:

• A SeaweedFS entry under Common Integrations and Examples: SeaweedFS table buckets serve an Iceberg REST catalog for table metadata while the table bucket stores the table data as Parquet files behind the same S3 gateway, so one config block covers catalog and FileIO.
• A SeaweedFS section under FileIO next to the other S3-compatible stores, since plain SeaweedFS buckets work with the existing S3FileIO / PyArrowFileIO.

The example configuration is verified directly against PyIceberg 0.10.0 and the current SeaweedFS release with exactly the properties shown (no region needed): create_namespace, create_table, append, scan round trip, drop_table, drop_namespace. SeaweedFS also runs PyIceberg-based Iceberg CI suites on every pull request: https://github.com/seaweedfs/seaweedfs/tree/master/test/s3tables

[Copilot]

Pull request overview

Adds documentation examples for configuring PyIceberg to work with SeaweedFS, covering both S3-compatible FileIO settings and an Iceberg REST catalog configuration.

Changes:

• Added a SeaweedFS entry to the “Common Integrations and Examples” S3-compatible FileIO section.
• Added a SeaweedFS subsection under the REST catalog configuration examples.

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