RTMP refactor events parsing

[wkozyra95]

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[Copilot]

Pull request overview

Refactors RTMP message/event handling to parse media and metadata into typed RTMP message variants (Audio/Video/Data) instead of a single Event wrapper, and adjusts some connection/protocol constants and shutdown behavior.

Changes:

• Split RTMP parsing/serialization into AudioMessage, VideoMessage, and DataMessage variants and update server/client connection threads accordingly.
• Replace FLV ScriptData metadata parsing with direct AMF0 value handling for onMetaData.
• Minor protocol tweaks (peer bandwidth constant, chunk stream id naming) and connection shutdown handling.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
smelter-core/src/pipeline/rtmp/rtmp_input/connection.rs	Renames “decoder channel closed” error variant and maps send failures to the new name.
rtmp/src/server/negotiation.rs	Updates PEER_BANDWIDTH constant.
rtmp/src/server/connection_thread.rs	Converts parsed RtmpMessage variants into RtmpEvent and forwards them to the pipeline.
rtmp/src/protocol/message_stream.rs	Uses RtmpMessage::is_media_packet() for log level selection.
rtmp/src/message/mod.rs	Introduces new RtmpMessage variants (Audio/Video/Data) and is_media_packet() helper.
rtmp/src/message/parse.rs	Parses raw RTMP messages into the new typed RtmpMessage variants.
rtmp/src/message/serialize.rs	Serializes new typed message variants (AMF0 data message + audio/video raw serialization).
rtmp/src/message/audio.rs	New: audio message parse/serialize implementation.
rtmp/src/message/video.rs	New: video message parse/serialize implementation.
rtmp/src/message/data.rs	New: AMF0 data message parsing for onMetaData.
rtmp/src/message/event.rs	Removed legacy event-based parsing/serialization.
rtmp/src/flv/scriptdata.rs	Removed legacy ScriptData representation.
rtmp/src/flv/mod.rs	Removes ScriptData re-exports.
rtmp/src/events.rs	Updates RtmpEvent variants for unknown media + metadata payload type.
rtmp/src/client.rs	Sends typed messages instead of RtmpMessage::Event and emits DeleteStream on drop.

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