Remove DashSync avatar and profile tail

[llbartekll]

Summary

• replace the DashSync avatar transport with an app-owned Moya/HTTPClient Imgur client while preserving DWUploadAvatarModel's Objective-C/KVO contract
• remove the unreachable outgoing invitation create/send/history flow and its exclusive assets while retaining link, paste, scan, claim, inviter-preview, and post-claim contact paths
• move active Home/profile/edit reads and writes to DWCurrentUserIdentityInfo and DWProfileUpdateBridge
• remove dead legacy profile/QR containers, DSBlockchainIdentity UI categories, and the orphan avatar view
• update migration/teardown documentation and mark the superseded outgoing-invitations proposal as historical

Avatar behavior

• exact image / image.jpg / image/jpeg multipart contract
• existing 600×600 resize and JPEG quality 0.5
• delete-before-upload with four total delete attempts; upload continues after exhausted delete failures
• no automatic upload retry; manual Retry restarts the complete cycle
• composite cancellation plus request/attempt generations suppress stale transport completions and state mutations
• all state and resultURLString mutations remain on the main thread

Verification

• dashpay Debug generic arm64 iOS Simulator build: passed
• focused avatar test bundle compilation: passed (16 tests)
• plutil -lint DashWallet.xcodeproj/project.pbxproj: passed
• git diff --check: passed
• DashSync import/type and deleted-asset caller audits: passed

The native dashwallet build and test scheme remain blocked before app compilation by the local Watch runtime mismatch (23S303 runtime vs 23T570 SDK). The identical failure was reproduced on the untouched base. An isolated dashpay test-host diagnostic compiled the focused tests; runtime execution remains unavailable because that diagnostic host duplicates app classes.

Scope

Apple Watch, Podfile DashSync entries, storage/keychain, SDK/platform, DASHSYNC_KEY_MIGRATION.md, and DWUpholdMainnetConstants.m are unchanged.

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