feat: remove GPU support and simplify to CPU-only architecture

README.md

@@ -1,6 +1,6 @@
 # Real-ESRGAN API
 
-REST API wrapping [Real-ESRGAN](https://github.com/xinntao/Real-ESRGAN) for image upscaling. Features synchronous and asynchronous (job-based) processing with multi-target Docker builds (CPU + CUDA GPU support).
+REST API wrapping [Real-ESRGAN](https://github.com/xinntao/Real-ESRGAN) for image upscaling. Features synchronous and asynchronous (job-based) processing with Docker containerization.
 
 ## Features
 
@@ -9,15 +9,15 @@ REST API wrapping [Real-ESRGAN](https://github.com/xinntao/Real-ESRGAN) for imag
 - **Multi-Model Support**: Multiple Real-ESRGAN models (2x, 3x, 4x upscaling)
 - **Batch Processing**: Process up to 100 images per batch request
 - **Model Management**: Download and manage upscaling models
-- **Docker Deployment**: CPU and CUDA GPU support with multi-target builds
+- **Docker Deployment**: Simplified containerized deployment
 - **Gitea CI/CD**: Automatic Docker image building and publishing
 - **API Documentation**: Interactive Swagger UI and ReDoc
 - **Health Checks**: Kubernetes-ready liveness and readiness probes
-- **System Monitoring**: CPU, memory, disk, and GPU metrics
+- **System Monitoring**: CPU, memory, and disk metrics
 
 ## Quick Start
 
-### Local Development (CPU)
+### Local Development
 
 ```bash
 # Build and run
@@ -47,14 +47,6 @@ curl http://localhost:8000/api/v1/jobs/{job_id}
 curl http://localhost:8000/api/v1/jobs/{job_id}/result -o output.jpg
 ```
 
-### GPU Support
-
-```bash
-# Build with GPU support and run
-docker compose -f docker-compose.gpu.yml build
-docker compose -f docker-compose.gpu.yml up -d
-```
-
 ## API Endpoints
 
 ### Upscaling
@@ -122,14 +114,14 @@ RSR_AUTO_CLEANUP_HOURS=24              # Auto cleanup interval
 
 ## Docker Deployment
 
-### Development (CPU)
+### Local/Development
 
 ```bash
 docker compose build
 docker compose up -d
 ```
 
-### Production (GPU)
+### Production
 
 ```bash
 docker compose -f docker-compose.prod.yml up -d
@@ -139,7 +131,7 @@ docker compose -f docker-compose.prod.yml up -d
 
 The `.gitea/workflows/build.yml` automatically:
 
-1. Builds Docker images for CPU and GPU variants
+1. Builds Docker image
 2. Publishes to Gitea Container Registry
 3. Tags with git commit SHA and latest
 
@@ -174,7 +166,6 @@ app/
 
 - **Synchronous Upscaling**: Best for small images (< 4MP)
 - **Asynchronous Jobs**: Recommended for large batches or high concurrency
-- **GPU Performance**: 2-5x faster than CPU depending on model and image size
 - **Tile Processing**: Efficiently handles images up to 8K resolution
 
 ## Development
@@ -182,7 +173,7 @@ app/
 Install dependencies:
 
 ```bash
-pip install -r requirements.txt -r requirements-cpu.txt
+pip install -r requirements.txt
 ```
 
 Run locally: