feat: add auth0 token endpoint

Author: aeltorio

client/public/openapi.json

@@ -1586,6 +1586,73 @@
         }
       }
     },
+    "/api/__auth0/token": {
+      "post": {
+        "summary": "Get Auth0 Management API token",
+        "description": "Request an Auth0 Management API JWT token using the Client Credentials grant.\nThis endpoint requires `ADMIN_AUTH0_PERMISSION` and uses the following\nenvironment variables: `AUTH0_CLIENT_ID`, `AUTH0_CLIENT_SECRET`, and `AUTH0_DOMAIN`.\nReturns a JSON response containing access_token, token_type, and expires_in when successful.\n",
+        "tags": [
+          "System",
+          "Auth0"
+        ],
+        "responses": {
+          "200": {
+            "description": "Successfully obtained Auth0 management API token",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "access_token": {
+                      "type": "string"
+                    },
+                    "token_type": {
+                      "type": "string"
+                    },
+                    "expires_in": {
+                      "type": "integer"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "403": {
+            "description": "Unauthorized - `ADMIN_AUTH0_PERMISSION` required",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "success": {
+                      "type": "boolean",
+                      "example": false
+                    },
+                    "error": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "Server error while requesting Auth0 token",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "error": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    },
     "/api/__d1/schema": {
       "get": {
         "summary": "Get database table names (available only for D1)",