Fix read model DbContext auto-registration on iOS NativeAOT#2256
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Observed regression starts at v20.10.10, where AOT safeguards were reverted and this path remained dependent on Types.Types.Instance/DependencyContext discovery. On iOS NativeAOT, DependencyContext can be unavailable, so FindMultiple<T>() may return no DbContext types and auto-registration silently skips contexts. Switch discovery to scan the explicitly provided assemblies directly, which also avoids simple-name collisions when multiple DbContext types share the same class name in different namespaces.
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Fixed
Types.Types.Instancediscovery (AddReadModelDbContextsWithConnectionStringFromAssemblies silently fails to register contexts on iOS (MAUI) #2255).DependencyContext-dependent discovery path that can return no DbContext types on iOS, causing startup resolution failures (AddReadModelDbContextsWithConnectionStringFromAssemblies silently fails to register contexts on iOS (MAUI) #2255).