Chore/consistent services and error handlers (#2101)

* Update index.ts

* Update buildChatflow.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Consistency

* Rename ApiError to InternalServerError

* Use InternalFlowiseError in controllers

* Use InternalFlowiseError in services

* Catch routes without preconditioned parameters

* Reconfigure the route precondition checks

* Fix router precondition checks

* cleanup status codes, get proper error messages

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Co-authored-by: Henry <hzj94@hotmail.com>

packages/server/src/routes/node-load-methods/index.ts

@@ -2,6 +2,6 @@ import express from 'express'
 import nodesRouter from '../../controllers/nodes'
 const router = express.Router()
 
-router.post('/:name', nodesRouter.getSingleNodeAsyncOptions)
+router.post(['/', '/:name'], nodesRouter.getSingleNodeAsyncOptions)
 
 export default router