feat(server): add EGFX server integration with DVC bridge

[glamberson]

Summary

Wire ironrdp-egfx's GraphicsPipelineServer into ironrdp-server, enabling H.264 AVC420/AVC444 video streaming to RDP clients via the EGFX dynamic virtual channel.

This builds on #1057 (merged) which added the EGFX PDU types and server state machine. This PR adds the integration layer that connects it to the server connection lifecycle.

Changes to ironrdp-egfx

• Make CHANNEL_NAME public for cross-crate DVC registration
• Add ZGFX uncompressed segment wrapping for DVC wire format (MS-RDPEGFX 2.2.5)
• Auto-send ResetGraphics before first CreateSurface per MS-RDPEGFX requirement
• Track DVC channel_id from start() for proactive frame encoding
• Rewrite drain_output() to ZGFX-wrap PDUs for DVC transmission

New ironrdp-server gfx module (behind egfx feature)

• GfxServerFactory trait following the CliprdrServerFactory / SoundServerFactory pattern
• GfxDvcBridge: Arc<Mutex> wrapper enabling shared access between DVC message processing and proactive frame submission from display handlers
• ServerEvent::Egfx variant for routing EGFX PDUs to the wire
• Builder integration with with_gfx_factory()

Design notes

• Uses std::sync::Mutex (not tokio) because DvcProcessor trait methods are synchronous
• ZGFX wrapping is uncompressed-only for now; compressed mode can be added as a follow-up when feat(zgfx): add segment wrapping utilities #1076 merges
• Capability negotiation intersects client and server flags per protocol spec
• The egfx feature is optional and off by default, so no impact on existing users

Test plan

• cargo fmt --all -- --check: clean
• cargo clippy --workspace --all-targets --features helper,__bench -- -D warnings: clean
• cargo clippy -p ironrdp-egfx -p ironrdp-server --features egfx -- -D warnings: clean
• cargo test --workspace: 1058 passed, 0 failed
• Updated test_surface_lifecycle to account for auto-ResetGraphics PDU

[glamberson]

I nearly forgot about thsi one...

[Copilot]

Pull request overview

This PR integrates the EGFX (Graphics Pipeline Extension) server from ironrdp-egfx into ironrdp-server, enabling H.264 AVC420/AVC444 video streaming to RDP clients via the EGFX dynamic virtual channel. The integration builds on PR #1057 which added the EGFX PDU types and server state machine.

Changes:

• Added ZGFX uncompressed segment wrapping for DVC wire format compliance with MS-RDPEGFX 2.2.5
• Implemented auto-send of ResetGraphics PDU before first CreateSurface per MS-RDPEGFX requirements
• Created GfxServerFactory trait and GfxDvcBridge for integrating EGFX with the server DVC infrastructure

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
crates/ironrdp-egfx/src/lib.rs	Made CHANNEL_NAME public for cross-crate DVC registration
crates/ironrdp-egfx/src/server.rs	Added ZGFX wrapping, auto-ResetGraphics, channel_id tracking, and rewrote drain_output()
crates/ironrdp-server/src/lib.rs	Exposed gfx module under egfx feature flag
crates/ironrdp-server/src/gfx.rs	New module with GfxServerFactory trait and GfxDvcBridge DVC processor
crates/ironrdp-server/src/builder.rs	Added with_gfx_factory() builder method
crates/ironrdp-server/src/server.rs	Integrated GfxServerFactory, added ServerEvent::Egfx variant, wired DVC bridge
crates/ironrdp-server/Cargo.toml	Added egfx optional feature and ironrdp-egfx dependency
crates/ironrdp-testsuite-core/tests/egfx/server.rs	Updated test to expect auto-sent ResetGraphics PDU
Cargo.lock	Added ironrdp-egfx dependency to ironrdp-server

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[glamberson]

Great. issues resolved and rebased. Thanks.