mlsmaycon 036e91cdea feat(proxy): restore SyncMappings bidirectional stream with ack back-pressure ...

Reinstates the SyncMappings RPC that landed on origin/main and the
client-side fallback to GetMappingUpdate.

- proto: SyncMappings RPC + SyncMappingsRequest{Init|Ack} +
  SyncMappingsResponse messages.
- management proxy.go: SyncMappings server handler, recvSyncInit,
  sendSnapshotSync (per-batch send-then-wait-for-ack), drainRecv,
  waitForAck; proxyConnection.syncStream + sendResponse routes the
  same sendChan onto the bidi stream when set.
- proxy/server.go: trySyncMappings + handleSyncMappingsStream that
  acks after each batch is processed; outer loop tries SyncMappings
  first and falls back to GetMappingUpdate on Unimplemented.
  Capabilities lifted into proxyCapabilities() so both code paths
  use the same flags.

2026-05-20 23:19:25 +02:00

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