Add esbuild node_bundler configuration to fix 502 error

- Add node_bundler = 'esbuild' to support ESM imports in functions
- This fixes the 502 error caused by node-fetch v3 ESM import requirements
- Functions now properly support modern JavaScript import syntax

Author: RyannosaurusRex

netlify.toml

@@ -19,6 +19,9 @@
 
   functions = "netlify/functions-all"
 
+[functions]
+  node_bundler = "esbuild"
+
 [build.environment]
   NODE_VERSION = "22"