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>

api/app/templates/logs.html

@@ -42,6 +42,9 @@
                 <button type="button" class="btn btn-sm btn-outline-success" onclick="filterOrders('IMPORTED')">
                     Importate <span class="badge bg-light text-dark ms-1" id="countImported">0</span>
                 </button>
+                <button type="button" class="btn btn-sm btn-outline-info" onclick="filterOrders('ALREADY_IMPORTED')">
+                    Deja imp. <span class="badge bg-light text-dark ms-1" id="countAlreadyImported">0</span>
+                </button>
                 <button type="button" class="btn btn-sm btn-outline-warning" onclick="filterOrders('SKIPPED')">
                     Omise <span class="badge bg-light text-dark ms-1" id="countSkipped">0</span>
                 </button>