Add a missing library for image generation capabilities

Add the httpx library to the project's dependencies in requirements.txt to resolve ModuleNotFoundError during deployment.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: a662ebb5-fd71-4dd7-ad81-6f1890051700
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 03210b14-ce90-472d-935c-435874173db0
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requirements.txt

@@ -11,3 +11,4 @@ basicsr==1.4.2
 gfpgan==1.3.8
 rembg==2.0.50
 onnxruntime==1.17.0
+httpx==0.27.0