Rename Ganjoor -> Diwan throughout the code
Projects (GanjooRazor -> DiwanRazor, GanjoorService.sln -> DiwanService.sln), files,
folders, classes, namespaces, settings, API routes (/api/diwan) and DB tables (Diwan*).
External addresses (ganjoor.net, github.com/ganjoor) unchanged. Migrations renamed
consistently (no pending model changes); requires a fresh database.
Upstream RUNNING_LOCALLY/SEMANTIC_SEARCH docs archived unmodified under docs/.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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