fix: attach db on worker threads in parallel analysis-stats inference The next-generation trait solver stores the `HirDatabase` in a thread-local, set via `hir::attach_db`. `analysis-stats` attaches it once on the main thread, but the `--parallel` inference path runs `InferenceResult::of` on rayon worker threads that never attach it, so every parallel run panicked with "Try to use attached db, but not db is attached" at `next_solver/interner.rs`. Wrap the per-body inference in `hir::attach_db` so each worker has the database attached. Claude-Session: https://claude.ai/code/session_01RVkhEnTji2EUTKbwmQtJYR
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