Add console command for merging duplicate photos

[makhin]

Summary

• add photo deduplication service to merge photos sharing the same image hash and move their file records to the primary photo
• expose the deduplication logic through a new merge-duplicates console command and wire it into dependency injection
• document the new CLI capability in the console README

Testing

• dotnet build PhotoBank.Console.csproj

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[chatgpt-codex-connector]

Replace untranslatable GroupBy ToList projection

The new duplicate merge command will throw before doing any work because the grouping pipeline builds PhotoIds = g.Select(p => p.Id).OrderBy(id => id).ToList() inside the EF Core query (lines 34-38). Npgsql/EF Core cannot translate ToList() within a grouped projection, so running merge-duplicates will raise “The LINQ expression … could not be translated” instead of returning duplicate groups. Materialize only translatable aggregates (e.g., Count/Min) or fetch the ID lists in a separate query so the command can execute.

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