fix: hardcode community workflows API URL

Remove configurable COMMUNITY_WORKFLOWS_API_URL env var that caused
errors when users copied the placeholder from .env.example.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.env.example

@@ -14,6 +14,3 @@ REPLICATE_API_KEY=your_replicate_api_key_here
 # Get your API key from: https://fal.ai/dashboard/keys
 FAL_API_KEY=your_fal_api_key_here
 
-# Community Workflows API URL (Optional - defaults to node-banana-pro hosted service)
-# Set this if you're self-hosting the community workflows
-COMMUNITY_WORKFLOWS_API_URL=https://your-node-banana-pro-instance.com/api/public/community-workflows

src/app/api/community-workflows/[id]/route.ts

@@ -1,8 +1,6 @@
 import { NextResponse } from "next/server";
 
-// Default to node-banana-pro hosted service
 const COMMUNITY_WORKFLOWS_API_URL =
-  process.env.COMMUNITY_WORKFLOWS_API_URL ||
   "https://nodebananapro.com/api/public/community-workflows";
 
 // Allowed hostnames for presigned URL fetches (SSRF protection)

src/app/api/community-workflows/route.ts

@@ -1,8 +1,6 @@
 import { NextResponse } from "next/server";
 
-// Default to node-banana-pro hosted service
 const COMMUNITY_WORKFLOWS_API_URL =
-  process.env.COMMUNITY_WORKFLOWS_API_URL ||
   "https://nodebananapro.com/api/public/community-workflows";
 
 /**