Add unified port configuration system

- Unified API and WebUI on single configurable port (default: 4567)
- Added strix.yaml configuration file support (go2rtc-style format)
- Environment variable STRIX_API_LISTEN overrides config file
- Port validation and source logging
- Relative URLs in frontend for automatic port detection
- Removed separate server instances
- Cleaned up temporary files and updated .gitignore
- Updated documentation with configuration examples

.gitignore

@@ -1,6 +1,7 @@
 # Binaries
 bin/
 strix
+main
 *.exe
 *.exe~
 *.dll
@@ -37,4 +38,9 @@ Thumbs.db
 
 # Temporary files
 tmp/
-temp/
+temp/
+*.dump
+*_output.txt
+
+# Configuration (user-specific)
+strix.yaml