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fix(#GO-1027): serialize proxyroutes ConfigMap writes to prevent partial nginx.conf (#918)

Concurrent bridge activations race on the proxyroutes ConfigMap: each
   reads N entries, adds one, and writes N+1 back — the last writer wins,
   silently dropping entries from earlier writers. With 45 bridges this
   leaves only a few server blocks in Stowaway's nginx.conf.

   Add an asyncio.Lock around the read-modify-write in
   _edit_proxyroutes_configmap() so concurrent calls are serialized. This
   follows the same locking pattern already used in the bridge and client
   handlers

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