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/static/js/config.js

@@ -580,6 +580,49 @@ const Config = (() => {
         }
     }
 
+    // -------------------------------------------------------------------------
+    // Vehicle Compatibility Source
+    // -------------------------------------------------------------------------
+    async function loadVehicleCompatSource() {
+        try {
+            var res = await fetch(API + '/vehicle-compat-source', { headers: headers() });
+            if (!res.ok) return;
+            var d = await res.json();
+            var sel = document.getElementById('cfg-compat-source');
+            if (sel) sel.value = d.source || 'both';
+        } catch (e) {
+            console.error('Config.loadVehicleCompatSource:', e);
+        }
+    }
+
+    async function saveVehicleCompatSource() {
+        var sel = document.getElementById('cfg-compat-source');
+        var btn = document.getElementById('btn-save-compat-source');
+        if (!sel) return;
+
+        if (btn) { btn.disabled = true; btn.textContent = 'Guardando...'; }
+
+        try {
+            var res = await fetch(API + '/vehicle-compat-source', {
+                method: 'PUT',
+                headers: headers(),
+                body: JSON.stringify({ source: sel.value })
+            });
+            if (!res.ok) {
+                var err = await res.json().catch(function() { return { error: res.statusText }; });
+                throw new Error(err.error || 'Save failed');
+            }
+            toast('Fuente de compatibilidad actualizada');
+        } catch (e) {
+            toast(e.message, 'error');
+        } finally {
+            if (btn) {
+                btn.disabled = false;
+                btn.textContent = 'Guardar';
+            }
+        }
+    }
+
     // -------------------------------------------------------------------------
     // Init
     // -------------------------------------------------------------------------
@@ -601,6 +644,12 @@ const Config = (() => {
         // Bind UI events
         bindEvents();
 
+        // Vehicle compat source save button
+        var btnCompat = document.getElementById('btn-save-compat-source');
+        if (btnCompat) {
+            btnCompat.addEventListener('click', saveVehicleCompatSource);
+        }
+
         // Kiosk mode toggle
         var kioskToggle = document.getElementById('cfg-kiosk-mode');
         if (kioskToggle && window.NexusKiosk) {
@@ -621,6 +670,7 @@ const Config = (() => {
         loadEmployees();
         loadBusiness();
         loadCurrency();
+        loadVehicleCompatSource();
     }
 
     document.addEventListener('DOMContentLoaded', init);