feat(sync): already_imported tracking, invoice cache, path fixes, remove vfp

- Track already_imported/new_imported counts separately in sync_runs
  and surface them in status API + dashboard last-run card
- Cache invoice data in SQLite orders table (factura_* columns);
  dashboard falls back to Oracle only for uncached imported orders
- Resolve JSON_OUTPUT_DIR and SQLITE_DB_PATH relative to known
  anchored roots in config.py, independent of CWD (fixes WSL2 start)
- Use single Oracle connection for entire validation phase (perf)
- Batch upsert web_products instead of one-by-one
- Remove stale VFP scripts (replaced by gomag-vending.prg workflow)

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

.gitignore

@@ -22,7 +22,7 @@ __pycache__/
 # Settings files with secrets
 settings.ini
 vfp/settings.ini
-vfp/output/
+output/
 vfp/*.json
 *.~pck
 .claude/HANDOFF.md