feat: configurable vehicle compatibility source (TecDoc / QWEN / Both)

Backend:
- Added GET/PUT /pos/api/config/vehicle-compat-source endpoints
- Added get_compat_source() helper reading from tenant_config
- create_item() now respects config: runs TecDoc and/or QWEN accordingly
- auto_match_item_vehicles() respects config: runs only configured source

Frontend:
- Added 'Compatibilidad de Vehiculos' section in config.html
- Added loadVehicleCompatSource() / saveVehicleCompatSource() in config.js
- Regenerated config.min.js

pos/services/inventory_vehicle_compat.py

@@ -12,6 +12,29 @@ Features:
 from typing import List, Dict, Optional
 
 
+def get_compat_source(tenant_id):
+    """Return the configured compatibility source: 'tecdoc', 'qwen', or 'both'.
+
+    Reads from tenant_config table. Defaults to 'both'.
+    """
+    from tenant_db import get_tenant_conn
+    try:
+        conn = get_tenant_conn(tenant_id)
+        cur = conn.cursor()
+        cur.execute(
+            "SELECT value FROM tenant_config WHERE key = 'vehicle_compat_source'"
+        )
+        row = cur.fetchone()
+        cur.close()
+        conn.close()
+        source = row[0] if row else 'both'
+        if source in ('tecdoc', 'qwen', 'both'):
+            return source
+    except Exception:
+        pass
+    return 'both'
+
+
 def auto_match_vehicle_compatibility(master_conn, tenant_conn, inventory_id, part_number,
                                      brand=None, name=None):
     """Find vehicle compatibility for an inventory item by part_number.