Add custom logger with source location tracking and remove verbose database logs

- Create internal/logger package with Logger wrapper around slog
- Logger automatically adds source file, line number, and function name to all log entries
- Use golang.org/x/term to properly detect if stdout is a terminal
- Replace all slog.Logger usage with logger.Logger throughout the codebase
- Remove verbose logging from database GetStats() method
- Update all constructors and dependencies to use the new logger

cmd/streamdumper/main.go

@@ -9,16 +9,14 @@ import (
 	"os/signal"
 	"syscall"
 
+	"git.eeqj.de/sneak/routewatch/internal/logger"
 	"git.eeqj.de/sneak/routewatch/internal/metrics"
 	"git.eeqj.de/sneak/routewatch/internal/streamer"
-	"log/slog"
 )
 
 func main() {
-	// Set up logger to only show errors
-	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
-		Level: slog.LevelError,
-	}))
+	// Set up logger
+	logger := logger.New()
 
 	// Create metrics tracker
 	metricsTracker := metrics.New()