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

internal/routewatch/cli.go

@@ -2,12 +2,12 @@ package routewatch
 
 import (
 	"context"
-	"log/slog"
 	"os"
 	"os/signal"
 	"syscall"
 	"time"
 
+	"git.eeqj.de/sneak/routewatch/internal/logger"
 	"go.uber.org/fx"
 )
 
@@ -21,7 +21,7 @@ func CLIEntry() {
 	app := fx.New(
 		getModule(),
 		fx.StopTimeout(shutdownTimeout), // Allow 60 seconds for graceful shutdown
-		fx.Invoke(func(lc fx.Lifecycle, rw *RouteWatch, logger *slog.Logger) {
+		fx.Invoke(func(lc fx.Lifecycle, rw *RouteWatch, logger *logger.Logger) {
 			lc.Append(fx.Hook{
 				OnStart: func(_ context.Context) error {
 					go func() {