spike(flatpak): add MVP manifest scaffold

[TimInTech]

Ziel

Dieser PR ergänzt einen experimentellen Flatpak-MVP-Scaffold für Blitztext Linux im bestehenden Repository. Ziel ist nur ein lokaler Packaging-Spike, kein Release- oder Flathub-Setup.

Scope

Enthalten:

• packaging/flatpak/io.github.TimInTech.BlitztextLinux.yaml
• packaging/flatpak/blitztext-linux.sh
• packaging/flatpak/requirements-flatpak.txt
• packaging/flatpak/README.md

Der MVP fokussiert:

• GUI-Start innerhalb einer Flatpak-Sandbox
• Qt-Clipboard-Fallback
• PulseAudio-Aufnahme
• OpenAI-Cloud-Aufrufe

Bewusst nicht enthalten:

• globale Hotkeys über evdev/input
• ydotool-Auto-Paste
• lokale Whisper/Torch-Transkription im Flatpak-Build
• Desktop-Datei, AppStream, Icon oder Flathub-Einreichung
• Release, Tag oder Version-Bump

Grenzen

Das Manifest ist für lokale MVP-Tests gedacht und noch nicht Flathub-konform. Insbesondere sind pip-/Netzwerkabhängigkeiten und vendored Sources noch nicht final gelöst.

Ein vollständiger Build wurde bewusst nicht ausgeführt, weil dafür größere Runtime-/Build-Downloads nötig wären.

Verifikation

Lokal grün:

• python3 -m compileall app tests
• QT_QPA_PLATFORM=offscreen WHISPER_GUI_TESTS=1 python -m pytest -q
• bash -n scripts/install.sh
• bash -n scripts/verify.sh
• git diff --check
• Secret-Scan negativ
• flatpak-builder --show-manifest OK
• flatpak-builder --show-deps OK

Rollback

Vor Merge: Branch/PR schließen und Branch löschen.

Nach Merge: Squash-Commit per git revert <squash-commit> zurücknehmen.

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[TimInTech]

@codex please review this PR.

Focus only on the Flatpak MVP spike scope:

• packaging/flatpak/io.github.TimInTech.BlitztextLinux.yaml
• packaging/flatpak/blitztext-linux.sh
• packaging/flatpak/requirements-flatpak.txt
• packaging/flatpak/README.md

Please check:

1. Manifest plausibility for a local Flatpak MVP, not Flathub readiness.
2. Launcher path correctness inside /app/share/blitztext-linux.
3. Dependency scope: PyQt6 + OpenAI only, no Whisper/Torch bundle.
4. Sandbox boundary claims: GUI, Qt Clipboard fallback, PulseAudio, OpenAI cloud calls.
5. Explicitly disabled/non-goals: global hotkeys, ydotool auto-paste, desktop/AppStream/icon, release, tag, version bump.
6. Any secret-risk or misleading documentation claims.

Do not make changes. Please return blockers vs non-blockers and the smallest safe next step.

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[TimInTech]

@codex please retry the code review for this PR.

Credits/auto top-up should now be active. Please review only the Flatpak MVP spike scope and do not make changes.

Focus:

• packaging/flatpak/io.github.TimInTech.BlitztextLinux.yaml
• packaging/flatpak/blitztext-linux.sh
• packaging/flatpak/requirements-flatpak.txt
• packaging/flatpak/README.md

Return blockers vs non-blockers and the smallest safe next step.

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