feat(packaging): export shareable x86_64 and ARM64 Flatpaks

[zortos293]

Fix Flatpak export by removing the unsupported 1024×1024 PNG icon during cleanup while keeping smaller icons and the SVG. Other package formats are unchanged.

Add an architecture choice to the manual workflow. x86_64 remains the default; aarch64 builds and verifies on the repository’s native ARM64 runner. Bundle and artifact names include the architecture, and the workflow checks the runner and installed package reference. ARM64 uses a checksum-pinned archive of the same Raspberry Pi FFmpeg revision as native ARM64 packages, preserving V4L2 request support. Both architectures build offline after fetching dependencies.

Document sharing, runtime downloads, and architecture selection. Add regressions for icon cleanup and architecture-specific FFmpeg source selection.

Validation:

• Seven Flatpak packaging tests pass, including failing-before regressions.
• actionlint and git diff --check pass.
• x86_64 export and installed-package verification passed before the ARM64 workflow extension. The downloaded bundle also passed startup/capability checks and library resolution on a second Linux environment.
• Native ARM64 build, export, installation, and verification pass on the final commit. Checks cover streamer capabilities, external updates, acceptance-verifier startup, and headless Qt startup.
• Downloaded the ARM64 bundle, imported and extracted it with OSTree, and checked all seven ELF executable/shared-library headers: every file is 64-bit AArch64. Metadata selects the aarch64 KDE runtime.

Live GFN gameplay and hardware GPU decoding have not been verified for these artifacts.

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