Rewrite iOS BLE relay uploads to loopback for the local photo receiver

[PhilippeFerreiraDeSousa]

Scope

Part 1 of OS-1796 (plan: agents/os-1796-ble-photo-phone-delivery-plan.md on the follow-up branches). Standalone bug fix: iOS/Android parity for the photo-receiver loopback rewrite.

The Android BLE fallback relay rewrites webhook URLs that target the in-process LocalPhotoUploadServer to 127.0.0.1 (LocalPhotoReceiverRegistry.loopbackUploadUrlFor), so BLE-relayed photos reach the app's own receiver even when the phone is off Wi-Fi or its LAN address changed after registration. iOS had no equivalent — BlePhotoUploadService.uploadToWebhook posted to the literal LAN URL, which fails whenever the phone isn't reachable at that address.

• New ios/Source/LocalPhotoReceiverRegistry.swift, a 1:1 port of the Java registry semantics (http/https + /upload path match on scheme/host/effective-port/query/fragment, host rewritten to 127.0.0.1). Placed in Source/ because BlePhotoUploadService compiles in both SDK build shapes, while the receiver module is expo-adapter-only.
• MentraPhotoReceiverModule registers the upload URL at both receiver-start return points and unregisters on stop/OnDestroy, matching the Android module.
• uploadToWebhook resolves the effective URL through the registry and logs when the rewrite fires, mirroring the Android relay.

Notes

• MentraPhotoReceiverModule.swift picked up a whole-file swiftformat pass (repo .swiftformat config; the file predated it) — the functional change there is only the three registry calls.
• Test evidence: swiftc -parse on the new file; on-device iOS verification (example app photo receiver, phone off Wi-Fi, BLE relay) still to be run and will be posted before merge.

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Note

Medium Risk
Touches photo upload routing in the BLE/SGCS path; wrong URL matching could misroute uploads, but scope is narrow and mirrors proven Android behavior.

Overview
Brings iOS in line with Android for BLE fallback photo delivery to the in-app LocalPhotoUploadServer. Glasses still get a LAN URL, but when the phone relays over BLE it can hit the same receiver via 127.0.0.1 instead of a stale Wi‑Fi address.

Adds LocalPhotoReceiverRegistry (Swift port of the Java registry): register/unregister active /upload URLs, and loopbackUploadUrl(for:) to rewrite matching webhook URLs to loopback while preserving port/path/query.

MentraPhotoReceiverModule registers the upload URL when the receiver starts (both code paths) and unregisters on stop/OnDestroy.

MentraLive.uploadToWebhook resolves the effective URL through the registry before POSTing and logs when a loopback rewrite is used.

MentraPhotoReceiverModule.swift also picked up a whole-file swiftformat pass; the behavioral change there is only the registry register/unregister calls.

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