feat(field_sales) : carte interactive Leaflet + écran de planification de tournée (ERP-127)

- API visitable_tiers (provider DBAL bbox/q/type, paginé) pour les pins de la carte
- POST /tours/{id}/reorder (drag & drop) : renumérotation atomique + recompute
- Layer front field-sales : TourMap (pins, popup, polyline, sélection rectangle),
  liste d'étapes draggable (vuedraggable), composable de planification + Vitest
- Pages /tours, /tours/new, /tours/[id]/plan (split responsive, point custom géocodé)
- i18n FR, deep links Waze/Google/Apple, état 100% local

frontend/package-lock.json

@@ -18,7 +18,8 @@
         "nuxt-toast": "^1.4.0",
         "pinia": "^3.0.4",
         "vue": "^3.5.29",
-        "vue-router": "^4.6.4"
+        "vue-router": "^4.6.4",
+        "vuedraggable": "^4.1.0"
       },
       "devDependencies": {
         "@nuxt/eslint-config": "^1.9.0",
@@ -15066,6 +15067,12 @@
         "node": ">=20.0.0"
       }
     },
+    "node_modules/sortablejs": {
+      "version": "1.14.0",
+      "resolved": "https://registry.npmjs.org/sortablejs/-/sortablejs-1.14.0.tgz",
+      "integrity": "sha512-pBXvQCs5/33fdN1/39pPL0NZF20LeRbLQ5jtnheIPN9JQAaufGjKdWduZn4U7wCtVuzKhmRkI0DFYHYRbB2H1w==",
+      "license": "MIT"
+    },
     "node_modules/source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -17569,6 +17576,18 @@
       "integrity": "sha512-sGhTPMuXqZ1rVOk32RylztWkfXTRhuS7vgAKv0zjqk8gbsHkJ7xfFf+jbySxt7tWObEJwyKaHMikV/WGDiQm8g==",
       "license": "MIT"
     },
+    "node_modules/vuedraggable": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/vuedraggable/-/vuedraggable-4.1.0.tgz",
+      "integrity": "sha512-FU5HCWBmsf20GpP3eudURW3WdWTKIbEIQxh9/8GE806hydR9qZqRRxRE3RjqX7PkuLuMQG/A7n3cfj9rCEchww==",
+      "license": "MIT",
+      "dependencies": {
+        "sortablejs": "1.14.0"
+      },
+      "peerDependencies": {
+        "vue": "^3.0.1"
+      }
+    },
     "node_modules/w3c-keyname": {
       "version": "2.2.8",
       "resolved": "https://registry.npmjs.org/w3c-keyname/-/w3c-keyname-2.2.8.tgz",