Remove macOS and Windows references from user-facing docs

Strip all macOS/Windows/WSL2 mentions from README.md and SERVICES.md.
Platform status, GPU support, permission examples, and config paths
now reflect Linux-only. TODO.md retains references as future roadmap tracking.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SERVICES.md

@@ -234,8 +234,6 @@ radarr.example.com {
 
 ### GPU Support
 - **Linux**: Intel GPU support via `/dev/dri` passthrough
-- **macOS**: No GPU acceleration available
-- **Windows**: Limited GPU support in WSL2
 
 ### Service Health Checks
 All web-based services include health checks for:
@@ -257,7 +255,6 @@ All web-based services include health checks for:
 **Contact HOPS for:**
 - Docker Compose generation issues
 - Service deployment problems
-- Cross-platform compatibility
 - Installation and automation issues
 
 ### Getting Service Help
@@ -272,11 +269,7 @@ All web-based services include health checks for:
 
 #### Permission Problems
 ```bash
-# Fix ownership for Linux
 sudo chown -R $USER:$USER /opt/appdata/[service-name]
-
-# Fix ownership for macOS
-sudo chown -R $USER:$USER ~/hops/config/[service-name]
 ```
 
 #### Service Won't Start
@@ -289,10 +282,7 @@ docker compose restart [service-name]
 ```
 
 #### Configuration Issues
-Most services store configuration in:
-- **Linux**: `/opt/appdata/[service-name]/`
-- **macOS**: `~/hops/config/[service-name]/`
-- **Windows**: `/opt/appdata/[service-name]/` (in WSL2)
+Service configuration is stored in `/opt/appdata/[service-name]/`.
 
 ---