feat(catalog): supplier catalog cleanup, fuzzy matching, and navigation fixes

- Cleaned 137+ fake engine-displacement models from supplier imports
  (v3/v4 scripts: Chevrolet, Ford, Chrysler, Dodge, Jeep, Nissan, etc.)
- Removed 1,251+ corrupted models (INT. prefixes, year-suffix, torque specs,
  empty names, trailing-year variants)
- Migrated supplier tables to master DB (supplier_catalog,
  supplier_catalog_compat, supplier_catalog_interchange)
- Fixed _get_mye_ids_with_parts() to query supplier_catalog_compat from
  master DB so supplier-only vehicles appear for all tenants
- Added fuzzy model matcher with parenthesis stripping, noise suffix removal,
  compact matching, prefix/substring fallback, model aliases, and ±3 year
  proximity
- Matched compat rows: KEEP GREEN +14,152, KNADIAN +3,021, VAZLO +127,500,
  LUK +477, RAYBESTOS +1,743
- Added KNADIAN catalog importer with year-range expansion and future-year
  filtering
- Added VAZLO catalog importer with position parsing and SKU-in-model cleanup
- Added Keep Green, LUK, Yokomitsu, Raybestos catalog importers
- Cache clearing after cleanups (_classify_cache_*, nexus:mye_ids:*,
  nexus:brand_mye_counts:*)

Final match rates:
- KEEP GREEN: 90.3%
- VAZLO: 93.6%
- YOKOMITSU: 100.0%
- KNADIAN: 57.4%
- LUK: 51.0%
- RAYBESTOS: 55.9%

pos/templates/inventory.html

@@ -183,6 +183,10 @@
           <h1 class="page-header__title">Inventario</h1>
         </div>
         <div class="page-header__actions">
+          <button class="btn btn--ghost" onclick="document.getElementById('bulkImportModal').classList.add('is-open')">
+            <svg viewBox="0 0 24 24"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="17 8 12 3 7 8"/><line x1="12" y1="3" x2="12" y2="15"/></svg>
+            Importar CSV
+          </button>
           <button class="btn btn--ghost" onclick="exportVisibleTableCSV('inventario')">
             <svg viewBox="0 0 24 24"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
             Exportar CSV
@@ -708,8 +712,20 @@
         <div class="inv-form-grid">
           <div class="inv-field"><label>No. Parte *</label><input type="text" id="newPartNumber" placeholder="Ej: GAT-50104" /></div>
           <div class="inv-field"><label>Nombre *</label><input type="text" id="newName" placeholder="Nombre del producto" /></div>
-          <div class="inv-field"><label>Marca</label><input type="text" id="newBrand" placeholder="Marca" /></div>
+          <div class="inv-field"><label>Marca</label><input type="text" id="newBrand" placeholder="Marca del fabricante" /></div>
+          <div class="inv-field"><label>Categoría</label>
+            <select class="select-filter" id="newCategory" onchange="onCategoryChange(this.value)" style="width:100%;">
+              <option value="">Selecciona categoría</option>
+            </select>
+          </div>
+          <div class="inv-field"><label>Subcategoría</label>
+            <select class="select-filter" id="newSubcategory" style="width:100%;" disabled>
+              <option value="">Selecciona categoría primero</option>
+            </select>
+          </div>
           <div class="inv-field"><label>Barcode</label><input type="text" id="newBarcode" placeholder="Auto-generado si vacío" /></div>
+          <div class="inv-field"><label>SKU Alternativo 1</label><input type="text" id="newSku2" placeholder="Ej: SKU-Bodega-A" /></div>
+          <div class="inv-field"><label>SKU Alternativo 2</label><input type="text" id="newSku3" placeholder="Ej: SKU-Bodega-B" /></div>
           <div class="inv-field"><label>Costo</label><input type="number" id="newCost" step="0.01" placeholder="0.00" /></div>
           <div class="inv-field"><label>Precio Mostrador</label><input type="number" id="newPrice1" step="0.01" placeholder="0.00" /></div>
           <div class="inv-field"><label>Stock Mínimo</label><input type="number" id="newMinStock" placeholder="0" /></div>
@@ -973,6 +989,47 @@
     </div>
   </div>
 
+  <!-- ══════════ Bulk Import Modal ══════════ -->
+  <div class="inv-modal-overlay" id="bulkImportModal">
+    <div class="inv-modal" style="max-width:520px;">
+      <div class="inv-modal__header">
+        <h3>Importar Productos Masivamente</h3>
+        <button class="inv-modal__close" onclick="document.getElementById('bulkImportModal').classList.remove('is-open')">&times;</button>
+      </div>
+      <div class="inv-modal__body">
+        <div style="margin-bottom:12px;">
+          <label style="display:block;margin-bottom:4px;font-size:var(--text-caption);color:var(--color-text-muted);">Archivo CSV o Excel</label>
+          <input type="file" id="bulkImportFile" accept=".csv,.xlsx,.xls" style="width:100%;padding:8px;border:1px dashed var(--color-border);border-radius:6px;background:var(--color-surface);color:var(--color-text);" />
+        </div>
+        <div style="margin-bottom:12px;">
+          <label style="display:block;margin-bottom:4px;font-size:var(--text-caption);color:var(--color-text-muted);">Modo de importación</label>
+          <select id="bulkImportMode" class="select-filter" style="width:100%;">
+            <option value="strict">Estricto — abortar al primer error</option>
+            <option value="lenient" selected>Permisivo — saltar filas con error</option>
+          </select>
+        </div>
+        <div style="margin-bottom:12px;">
+          <label style="display:block;margin-bottom:4px;font-size:var(--text-caption);color:var(--color-text-muted);">Compatibilidad de vehículo faltante</label>
+          <select id="bulkImportStrategy" class="select-filter" style="width:100%;">
+            <option value="qwen" selected>Auto-generar con IA (QWEN)</option>
+            <option value="skip">Omitir compatibilidad</option>
+            <option value="reject">Rechazar filas sin compatibilidad</option>
+          </select>
+        </div>
+        <div style="font-size:var(--text-caption);color:var(--color-text-muted);background:var(--color-surface);padding:10px;border-radius:6px;">
+          <strong>Columnas esperadas:</strong>
+          <code style="display:block;margin-top:4px;word-break:break-all;">sku, name, brand, price, stock, cost, location, description, category, make, model, year, engine, engine_code</code>
+          <span style="display:block;margin-top:4px;">También se aceptan sinónimos en español: <em>numero_de_parte, nombre, marca, precio, cantidad, costo, ubicacion, categoria, fabricante, modelo, anio, motor, codigo_motor</em></span>
+        </div>
+        <div id="bulkImportResult" style="margin-top:12px;display:none;"></div>
+      </div>
+      <div class="inv-modal__footer">
+        <button class="btn btn--ghost" onclick="document.getElementById('bulkImportModal').classList.remove('is-open')">Cancelar</button>
+        <button class="btn btn--primary" onclick="submitBulkImport()">Importar</button>
+      </div>
+    </div>
+  </div>
+
   <!-- Offline Banner -->
   <div id="offlineBanner" class="banner banner--warning" style="display:none;position:fixed;top:0;left:0;right:0;z-index:9999;border-radius:0;animation:none;">
     <span class="banner__icon"></span>