NEOlyzer v3.08: Discovery statistics table, PHA fix, catalog update f…

…ixes

- Add "Discovery Statistics by Site" chart with per-site discovery counts
  broken down by orbit class, H≤22 (≥140m), and PHA, with date range
  filtering, granularity options, and email-ready fixed-width export
- Fix PHA classification: now correctly uses H ≤ 22 AND Earth MOID ≤ 0.05 AU
  (was incorrectly using perihelion distance q < 0.05)
- Fix update_catalog.py: merge discovery tracklets from CSV before DB update
  so new objects get discovery date/site data populated
- Fix update_catalog.py: persist MOID values to database after JPL SBDB fetch
  (were being computed but discarded)
- Preserve existing discovery data when CSV has no match for an object
- Add recompute_pha_flags() to database.py for use after MOID fetch

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Add Issues link to Quick Start section of README

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

NEOlyzer v3.05 - First public release