Disable swagger docs in prod (#1520)

# why
When trying to run the server binary, was seeing `Error: ENOENT: no such
file or directory, open
'C:\Users\Administrator\Desktop\python\stagehand-python-stainless\bin\sea\static\logo.svg'`
# what changed
Only registering swagger docs when NODE_ENV is `developement`
# test plan
Will confirm that this resolves the error

<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Disable Swagger UI in production by registering it only when NODE_ENV is
"development". This prevents SEA binary runtime errors caused by missing
static assets (e.g., logo.svg).

<sup>Written for commit 46282a2.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

Author: monadoid

packages/server/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@browserbasehq/stagehand-server",
-  "version": "3.2.0",
+  "version": "3.3.0",
   "description": "Stagehand API server",
   "type": "module",
   "private": true,

packages/server/src/server.ts

@@ -144,9 +144,12 @@ const start = async () => {
       ...fastifyZodOpenApiTransformers,
     });
 
-    await app.register(fastifySwaggerUI, {
-      routePrefix: "/documentation",
-    });
+    // Only register Swagger UI in development - SEA binaries can't load static files
+    if (process.env.NODE_ENV === "development") {
+      await app.register(fastifySwaggerUI, {
+        routePrefix: "/documentation",
+      });
+    }
 
     app.setSchemaErrorFormatter(function (errors, dataVar) {
       const zodIssues = errors