docs(swagger): specify produced content-type

If @produce is not specified, angular-typescript generators don't
properly parse response and show them as Blobs instead of the actual
model.

docs/swagger.yaml

@@ -320,6 +320,8 @@ paths:
         required: true
         schema:
           $ref: '#/definitions/model.NewEndpoint'
+      produces:
+      - application/json
       responses:
         "201":
           description: Created
@@ -384,11 +386,13 @@ paths:
         required: true
         schema:
           $ref: '#/definitions/model.PatchedEndpoint'
+      produces:
+      - application/json
       responses:
         "200":
           description: OK
           schema:
-            $ref: '#/definitions/model.PatchedEndpoint'
+            $ref: '#/definitions/model.Endpoint'
         "400":
           description: Bad Request
         "404":

internal/handler/endpoint.go

@@ -117,6 +117,7 @@ func (e *Endpoint) list(w http.ResponseWriter, r *http.Request) {
 // @Summary Create a new endpoint.
 // @Accept json
 // @Param payload body model.NewEndpoint true "Endpoint's information"
+// @Produce json
 // @Success 201 {object} model.Endpoint
 // @Failure 400
 // @Failure 500
@@ -184,7 +185,8 @@ func (e *Endpoint) delete(w http.ResponseWriter, r *http.Request) {
 // @Summary Update the specified endpoint. Omitted or null fields will remain unchanged.
 // @Param sid path int true "Sid of the endpoint to be updated"
 // @Param payload body model.PatchedEndpoint true "Endpoint's fields to update"
-// @Success 200 {object} model.PatchedEndpoint
+// @Produce json
+// @Success 200 {object} model.Endpoint
 // @Failure 400
 // @Failure 404
 // @Failure 500