fix: forzar LF en entrypoint.sh + environments postman + limpiar variables coleccion

- .gitattributes: añadir '*.sh text eol=lf' para evitar CRLF en Windows
- deployments/entrypoint.sh: renormalizado a LF
- postman_environments.json: entornos LOCAL/DEV/PROD en un único fichero
- postman_collection.json: eliminadas variables por defecto (vienen del entorno)

.gitattributes

@@ -1,2 +1,5 @@
 # Auto detect text files and perform LF normalization
 * text=auto
+
+# Shell scripts: forzar LF siempre (evita CRLF en Windows que rompe Docker)
+*.sh text eol=lf

postman_collection.json

@@ -5,33 +5,7 @@
     "schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json",
     "_postman_id": "django-core-base-collection"
   },
-  "variable": [
-    {
-      "key": "base_url",
-      "value": "http://localhost:8000",
-      "type": "string"
-    },
-    {
-      "key": "access_token",
-      "value": "",
-      "type": "string"
-    },
-    {
-      "key": "refresh_token",
-      "value": "",
-      "type": "string"
-    },
-    {
-      "key": "username",
-      "value": "admin",
-      "type": "string"
-    },
-    {
-      "key": "password",
-      "value": "admin",
-      "type": "string"
-    }
-  ],
+  "variable": [],
   "item": [
     {
       "name": "Auth",

postman_environments.json

@@ -0,0 +1,35 @@
+{
+  "local": {
+    "id": "ftt19d5vxuj",
+    "v": 2,
+    "name": "LOCAL",
+    "variables": [
+      { "key": "base_url",     "secret": false, "initialValue": "http://localhost:8000",    "currentValue": "http://localhost:8000" },
+      { "key": "username",     "secret": false, "initialValue": "admin",                    "currentValue": "admin" },
+      { "key": "password",     "secret": false, "initialValue": "admin",                    "currentValue": "admin" },
+      { "key": "access_token", "secret": false, "initialValue": "",                         "currentValue": "" }
+    ]
+  },
+  "dev": {
+    "id": "x8jh10qysfo",
+    "v": 2,
+    "name": "DEV",
+    "variables": [
+      { "key": "base_url",     "secret": false, "initialValue": "https://dev.v-encore-lab.com", "currentValue": "https://dev.v-encore-lab.com" },
+      { "key": "username",     "secret": false, "initialValue": "admin",                        "currentValue": "admin" },
+      { "key": "password",     "secret": false, "initialValue": "admin",                        "currentValue": "admin" },
+      { "key": "access_token", "secret": false, "initialValue": "",                             "currentValue": "" }
+    ]
+  },
+  "prod": {
+    "id": "3ckrklvkf27",
+    "v": 2,
+    "name": "PROD",
+    "variables": [
+      { "key": "base_url",     "secret": false, "initialValue": "https://v-encore-lab.com", "currentValue": "https://v-encore-lab.com" },
+      { "key": "username",     "secret": false, "initialValue": "admin",                    "currentValue": "admin" },
+      { "key": "password",     "secret": false, "initialValue": "admin",                    "currentValue": "admin" },
+      { "key": "access_token", "secret": false, "initialValue": "",                         "currentValue": "" }
+    ]
+  }
+}