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/snapshotter/snapshotter.go

@@ -7,7 +7,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"log/slog"
+	"git.eeqj.de/sneak/routewatch/internal/logger"
 	"os"
 	"path/filepath"
 	"sync"
@@ -27,7 +27,7 @@ const (
 type Snapshotter struct {
 	rt           *routingtable.RoutingTable
 	stateDir     string
-	logger       *slog.Logger
+	logger       *logger.Logger
 	ctx          context.Context
 	cancel       context.CancelFunc
 	mu           sync.Mutex // Ensures only one snapshot runs at a time
@@ -36,7 +36,7 @@ type Snapshotter struct {
 }
 
 // New creates a new Snapshotter instance
-func New(rt *routingtable.RoutingTable, cfg *config.Config, logger *slog.Logger) (*Snapshotter, error) {
+func New(rt *routingtable.RoutingTable, cfg *config.Config, logger *logger.Logger) (*Snapshotter, error) {
 	stateDir := cfg.GetStateDir()
 
 	// If state directory is specified, ensure it exists