Working prototype with dev dashboard

- Created core Engine that coordinates all subsystems
- Extended API with comprehensive endpoints for dev dashboard
- Implemented pure Go vision processing (no GoCV dependency)
- Built full-featured dev dashboard with live capture viewer, region overlays, pixel inspector
- Added D2R detector with actual health/mana reading from orb regions
- Fixed resolution profile registration and region validation
- Generated synthetic test data for development
- Added dev mode support with file backend for testing
- Fixed build tag issues for cross-platform compilation

Prototype features:
✅ Live capture viewer with region overlays
✅ Real-time state detection (game state, health %, mana %)
✅ Pixel inspector (hover for RGB/HSV values)
✅ Capture stats monitoring (FPS, frame count)
✅ Region management with toggle visibility
✅ File upload for testing screenshots
✅ Dark theme dev-focused UI
✅ CORS enabled for dev convenience

Ready for: go run ./cmd/iso-bot --dev --api :8080

pkg/engine/capture/backends/registry.go

@@ -129,14 +129,24 @@ func ParseBackendType(s string) (BackendType, error) {
 func GetDefault() *Registry {
 	reg := NewRegistry()
 
-	// Register platform-specific backends
-	reg.Register(BackendWindowWin32, NewWin32Source)
-	reg.Register(BackendWindowX11, NewX11Source)
-	reg.Register(BackendWayland, NewWaylandSource)
-	reg.Register(BackendVNC, NewVNCSource)
-	reg.Register(BackendSpice, NewSpiceSource)
-	reg.Register(BackendMonitor, NewMonitorSource)
+	// Always register these core backends that work on all platforms
 	reg.Register(BackendFile, NewFileSource)
-
+	
+	// Platform-specific backends are registered via init() functions
+	// with appropriate build tags to avoid compilation errors
+	
 	return reg
+}
+
+// init function registers platform-specific backends.
+// Each platform will have its own init function with build tags.
+func init() {
+	defaultRegistry := GetDefault()
+	
+	// Register monitor backend (should work on most platforms)
+	if MonitorSourceAvailable() {
+		defaultRegistry.Register(BackendMonitor, NewMonitorSource)
+	}
+	
+	// Other backends registered via platform-specific init() functions
 }