fix: rename total to count in AIBridgeListInterceptionsResponse (#20410)

Thanks to the great work in #20393, we’ve successfully introduced
offset-based pagination for this endpoint. However, the frontend expects
a `count` field in the response rather than `total`. This PR updates the
response payload to rename the returned key to `count` for consistency
with frontend expectations and existing API patterns.

This is necessary to unblock the work in #20331

coderd/apidoc/docs.go

@@ -11766,14 +11766,14 @@ const docTemplate = `{
         "codersdk.AIBridgeListInterceptionsResponse": {
             "type": "object",
             "properties": {
+                "count": {
+                    "type": "integer"
+                },
                 "results": {
                     "type": "array",
                     "items": {
                         "$ref": "#/definitions/codersdk.AIBridgeInterception"
                     }
-                },
-                "total": {
-                    "type": "integer"
                 }
             }
         },

coderd/apidoc/swagger.json

@@ -10462,14 +10462,14 @@
 		"codersdk.AIBridgeListInterceptionsResponse": {
 			"type": "object",
 			"properties": {
+				"count": {
+					"type": "integer"
+				},
 				"results": {
 					"type": "array",
 					"items": {
 						"$ref": "#/definitions/codersdk.AIBridgeInterception"
 					}
-				},
-				"total": {
-					"type": "integer"
 				}
 			}
 		},