Partitioned tables: changes arrive under leaf partition names and are silently dropped

[lukashes]

pgoutput sends changes of a partitioned table under the leaf partition's relation name unless the publication sets publish_via_partition_root = true. Our publication doesn't (src/source/postgres/replication_protocol.zig:150-154), and matchStreams compares exact table names (src/processor/processor.zig:20), so a stream configured for the parent table matches nothing: every change to a partition is dropped with only a debug-level log line.

Ask, in two steps:

• Now: document the limitation (README / config example) — partitioned tables are not supported.
• Later: support them, likely via publish_via_partition_root on the publication; ties into Support tables outside the public schema #50 and the snapshot work in Initial snapshot of existing table data #49.