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/app.go

@@ -5,14 +5,13 @@ package routewatch
 import (
 	"context"
 	"fmt"
-	"log/slog"
 	"os"
-	"strings"
 	"sync"
 	"time"
 
 	"git.eeqj.de/sneak/routewatch/internal/config"
 	"git.eeqj.de/sneak/routewatch/internal/database"
+	"git.eeqj.de/sneak/routewatch/internal/logger"
 	"git.eeqj.de/sneak/routewatch/internal/metrics"
 	"git.eeqj.de/sneak/routewatch/internal/routingtable"
 	"git.eeqj.de/sneak/routewatch/internal/server"
@@ -35,7 +34,7 @@ type Dependencies struct {
 	RoutingTable *routingtable.RoutingTable
 	Streamer     *streamer.Streamer
 	Server       *server.Server
-	Logger       *slog.Logger
+	Logger       *logger.Logger
 	Config       *config.Config
 }
 
@@ -46,7 +45,7 @@ type RouteWatch struct {
 	streamer           *streamer.Streamer
 	server             *server.Server
 	snapshotter        *snapshotter.Snapshotter
-	logger             *slog.Logger
+	logger             *logger.Logger
 	maxRuntime         time.Duration
 	shutdown           bool
 	mu                 sync.Mutex
@@ -229,34 +228,11 @@ func (rw *RouteWatch) logRoutingTableStats(ctx context.Context) {
 	}
 }
 
-// NewLogger creates a structured logger
-func NewLogger() *slog.Logger {
-	level := slog.LevelInfo
-	if debug := os.Getenv("DEBUG"); strings.Contains(debug, "routewatch") {
-		level = slog.LevelDebug
-	}
-
-	opts := &slog.HandlerOptions{
-		Level: level,
-	}
-
-	var handler slog.Handler
-	if os.Stdout.Name() != "/dev/stdout" || os.Getenv("TERM") == "" {
-		// Not a terminal, use JSON
-		handler = slog.NewJSONHandler(os.Stdout, opts)
-	} else {
-		// Terminal, use text
-		handler = slog.NewTextHandler(os.Stdout, opts)
-	}
-
-	return slog.New(handler)
-}
-
 // getModule provides all fx dependencies
 func getModule() fx.Option {
 	return fx.Options(
 		fx.Provide(
-			NewLogger,
+			logger.New,
 			config.New,
 			metrics.New,
 			fx.Annotate(