Apply Roslyn/dotnet-format fixes across NeonSprawl.Server and
NeonSprawl.Server.Tests: collection expressions, concrete helper
return types, record XML docs, logging guards, quest store refactors,
and removal of redundant usings via GlobalUsings.cs. Extend
csharp-style.md with the recurring patterns.
Extend quest and resource-node fixture APIs so Bruno pre-requests can reset shared dev-local-1 state (cooldowns, nodes, inventory, quest progress) instead of relying on a fresh Postgres baseline.