fix(qt): render NVST frames in the Qt scene graph

[zortos293]

Corrects the external presenter contract introduced by #785 and #786.

• Replace the standalone streamer/presenter process with a linked Rust cdylib and a bounded, versioned C ABI; keep opennow-core out of process for account and session preparation only.
• Present decoded native frames inside QQuickRhiItem using Qt-owned D3D11, Metal, or Vulkan devices and Qt's active command stream, with explicit frame lifetime, synchronization, device-loss, pause, reconnect, and scene-graph teardown handling.
• Move gameplay keyboard, relative/absolute mouse, cursor capture, and up to four gamepads into the Qt/native runtime boundary; remove the obsolete surface controller, external-window orchestration, microphone path, and generalized browser WebRTC media path.
• Package the shared runtime beside the app with platform loader metadata, exclude the obsolete standalone executable from every release format, and assert those layouts in the release workflow.
• Make embedded capability negotiation backend-specific, fail closed on protocol/version and unsupported media paths, and update migration, acceptance, localization, and protocol documentation for the in-process architecture.

Verification:

• Linux Qt Release build and full CTest suite (62/62 passed)
• cargo fmt --all -- --check, workspace Clippy with -D warnings, and workspace tests for native/opennow-streamer
• cargo fmt --all -- --check, Clippy with -D warnings, and all tests for native/opennow-core
• npm run locales:check (891 keys)
• git diff --check
• Installed Linux binary has DT_NEEDED for libopennow_streamer_ffi.so, resolves it from $ORIGIN, excludes opennow-streamer, and passes an offscreen smoke launch from outside the build tree

Target-OS builds and real-device NVST acceptance remain required for Windows D3D11, macOS Metal, and Linux Vulkan presentation, including overlays, display/DPI changes, reconnect, device loss, teardown, input, and four-gamepad behavior.

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