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/app.py

@@ -62,6 +62,9 @@ def create_app():
     from blueprints.marketplace_external_bp import marketplace_ext_bp
     app.register_blueprint(marketplace_ext_bp)
 
+    from blueprints.dropshipping_bp import dropship_bp
+    app.register_blueprint(dropship_bp)
+
     from blueprints.peer_bp import peer_bp
     app.register_blueprint(peer_bp)
 
@@ -110,6 +113,9 @@ def create_app():
     from blueprints.supplier_portal_bp import supplier_portal_bp
     app.register_blueprint(supplier_portal_bp)
 
+    from blueprints.supplier_catalog_bp import supplier_catalog_bp
+    app.register_blueprint(supplier_catalog_bp)
+
     from blueprints.internal_bp import internal_bp
     app.register_blueprint(internal_bp)
 
@@ -131,6 +137,10 @@ def create_app():
                                tenant_name=getattr(g, 'tenant_name', None),
                                tenant_subdomain=getattr(g, 'tenant_subdomain', None))
 
+    @app.route('/pos/supplier-catalog')
+    def supplier_catalog_page():
+        return render_template('supplier_catalog.html')
+
     @app.route('/pos/catalog')
     def pos_catalog():
         return render_template('catalog.html')