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* util: serialize every ViperProxy method; stop promoting unlocked viper calls ViperProxy embedded *viper.Viper, so only the five declared methods took the mutex while every promoted call — GetStringMap in backend.LoadConfiguration was the reported crash — touched viper's maps unsynchronized. `weed server` starts the volume server (SetDefault writer) and the master (GetStringMap reader) back to back, and a race build reports the pair on a plain start. The wrapped viper is now a named field: a method must be declared here to exist on the proxy, so unsynchronized access fails at compile time rather than at runtime. Every promoted use in the tree (GetStringMap, GetUint32, GetFloat64, GetDuration, IsSet, AllKeys, Set) gets a locked wrapper; NewViperProxy replaces struct literals for local vipers. GetStringMap deep-copies its result — viper hands back the internal subtree, so iterating it after the lock is released would race the next writer. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * util: take the shared lock while LoadConfiguration merges a config file viper.MergeInConfig rewrites the same maps the proxy serializes; without the lock a merge can race a concurrent SetDefault or reader exactly like the reported startup crash. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * util: deep-copy slice elements in the GetStringMap snapshot A slice of maps inside the returned subtree still shared the inner maps — copy elements recursively so nothing the caller mutates is viper's internal state. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * util: add the missing AutomaticEnv wrapper used by tests sse_reader_test reaches it through GetViper(); without the wrapper the call no longer exists once the viper field stopped being embedded. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * util: return a fresh slice from GetStringSlice A stored []string comes back uncast from viper — the backing array is shared internal state like the GetStringMap subtree, so copy it while holding the lock. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> --------- Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>