Gate 360 FPS on entitlement and the effective hardware decoder

[zortos293]

Changes

Stacked on #967, which depends on #964 and requires #961 before landing.

Offer 360 FPS at the documented 1920x1080 and 1920x1200 resolutions only when membership and the selected codec's hardware decoder are confirmed. Keep unavailable rates visible but disabled across desktop, console, and onboarding. Preserve a saved preference while capability results are still unknown; downgrade it only when a known constraint requires that.

Use the software-decode parent's backend resolver so the legacy software preference cannot qualify as hardware. Carry the selected rate through session creation, NVST negotiation, and platform frame-duration validation without the old 240 FPS clamp.

Independent verification

The final 20-file tree was independently inspected and checked against its exact checkpoint before publication.

• Core: 418 passed, 0 failed, 4 ignored.
• Full native streamer workspace with bundled FFmpeg: 680 passed, 0 failed, 15 ignored.
• Core and streamer formatting and locked Clippy with warnings denied passed.
• The Qt application and tests rebuilt successfully.
• All 39 focused frame-rate/onboarding tests passed.
• All 341 Qt tests passed in the complete independent rerun.
• Localization validation and all 158 Python packaging/contract tests passed.

Rendered acceptance fixtures were inspected for desktop, device-locked desktop, console, and onboarding. Coverage includes entitlement changes, unavailable or delayed capabilities, resolution changes, and the legacy software-backend interaction.

Limits

No entitled live account or 360 FPS gameplay session was available. Screenshots and entitlement responses are explicit acceptance fixtures. The macOS-specific duration change was inspected but cannot be exercised on this Linux machine. Final combined-stack checks remain required before the program's ordered merges.

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[capy-ai]

Rendered acceptance fixtures with confirmed capability and entitlement responses. These are not live signed-in gameplay evidence.