Fix edge functions bundle path (opennextjs#926)

* fix: correct edgeFunctions bundle path to server-functions directory

Update bundle path from .open-next/functions to .open-next/server-functions 
to match the actual build output location for edge functions

* feat: add additionalInject option support

Add additionalInject: fnOptions.additionalInject for injecting code 
directly into the banner section during esbuild. Use with caution.

* docs: update additionalInject option documentation

Improve JSDoc comment to clarify usage for esbuild banner injection 
and add caution note for safe usage

* changeset and remove additional inject

---------

Co-authored-by: Nicolas Dorseuil <[email protected]>

Author: psyrenpark

.changeset/five-parrots-eat.md

@@ -0,0 +1,5 @@
+---
+"@opennextjs/aws": patch
+---
+
+Fix output for edge-functions

packages/open-next/src/build/generateOutput.ts

@@ -181,7 +181,7 @@ export async function generateOutput(options: BuildOptions) {
   Object.entries(config.functions ?? {}).forEach(async ([key, value]) => {
     if (value.placement === "global") {
       edgeFunctions[key] = {
-        bundle: `.open-next/functions/${key}`,
+        bundle: `.open-next/server-functions/${key}`,
         handler: indexHandler,
         ...(await extractOverrideFn(value.override)),
       };