Feature/mms support foundation#317

Draft

stappmus wants to merge 9 commits intocapcom6:masterfrom

stappmus:feature/mms-support-foundation

Commits on Feb 6, 2026

[mms] establish attachment metadata contract for incoming MMS
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[mms] persist inbound attachment metadata for durable processing
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[mms] add outbound JSON and multipart media request pipeline
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[mms] secure local media storage with signed access and retention
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[mms] document media contract and enforce settings validation coverage
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[mms] wire carrier MMS transport into queued outbound flow
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[ui] refresh app shell and home visuals for clearer operations
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[mms] publish API contract updates for media and carrier guidance
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Commits on Feb 8, 2026

Finalize MMS support and build fixes
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