fix(streamer): harden Windows video transport and bounded recovery

[zortos293]

Summary

• Reserve exclusive Windows UDP sockets with bounded occupied-port fallback, and advertise the local address routed to the negotiated media peer.
• Bound media recovery across duplicate terminal events and session claims; reset only on real video progress and keep the embedded video surface visible during recovery.
• Report first-frame progress from the D3D11 path and persist transport/decode/control diagnostics, including zero-video-datagram and HTTP 503 failures.
• Add regression coverage and affected-PC retest guidance; support a shorter native artifact path for Windows builds.

Verification

• Native streamer workspace: 268 tests passed.
• Complete Qt suite: 64 tests passed; includes fullscreen/F3 and overlay smoke coverage.
• Full Windows build, packaged ZIP smoke test, and git diff --check passed.

Scope and remaining validation

The supplied trace received zero video UDP datagrams before decoding. These changes fix client transport/recovery defects, but playback on the affected Windows 11 / GTX 1650 PC still needs confirmation. External firewall/VPN/server failures, including HTTP 503, cannot be guaranteed resolved by a client patch.

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[zortos293]

Pre-merge verification: reran the complete local Windows Qt suite; all 64 tests passed (18.06s). GitHub CI is not green: qt-ci linux-x64 fails cargo fmt --manifest-path native/opennow-core/Cargo.toml -- --check exclusively in gfn.rs, which is identical to the target branch. qt-ci macOS fails CMake configuration because the runner Qt install lacks Qt6GuiPrivate; the required find_package declaration is unchanged from the target branch. No required merge checks are configured. These existing CI issues are not resolved by this focused streamer patch; affected-PC playback remains unverified.