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/routingtable/routingtable.go

@@ -5,7 +5,6 @@ import (
 	"compress/gzip"
 	"encoding/json"
 	"fmt"
-	"log/slog"
 	"os"
 	"path/filepath"
 	"strings"
@@ -14,6 +13,7 @@ import (
 	"time"
 
 	"git.eeqj.de/sneak/routewatch/internal/config"
+	"git.eeqj.de/sneak/routewatch/internal/logger"
 	"github.com/google/uuid"
 )
 
@@ -68,7 +68,7 @@ type RoutingTable struct {
 }
 
 // New creates a new routing table, loading from snapshot if available
-func New(cfg *config.Config, logger *slog.Logger) *RoutingTable {
+func New(cfg *config.Config, logger *logger.Logger) *RoutingTable {
 	rt := &RoutingTable{
 		routes:           make(map[RouteKey]*Route),
 		byPrefix:         make(map[uuid.UUID]map[RouteKey]*Route),
@@ -452,7 +452,7 @@ func isIPv6(prefix string) bool {
 }
 
 // loadFromSnapshot attempts to load the routing table from a snapshot file
-func (rt *RoutingTable) loadFromSnapshot(logger *slog.Logger) error {
+func (rt *RoutingTable) loadFromSnapshot(logger *logger.Logger) error {
 	// If no snapshot directory specified, nothing to load
 	if rt.snapshotDir == "" {
 		return nil

internal/routingtable/routingtable_test.go

@@ -1,18 +1,18 @@
 package routingtable
 
 import (
-	"log/slog"
 	"sync"
 	"testing"
 	"time"
 
 	"git.eeqj.de/sneak/routewatch/internal/config"
+	"git.eeqj.de/sneak/routewatch/internal/logger"
 	"github.com/google/uuid"
 )
 
 func TestRoutingTable(t *testing.T) {
 	// Create a test logger
-	logger := slog.Default()
+	logger := logger.New()
 
 	// Create test config with empty state dir (no snapshot loading)
 	cfg := &config.Config{
@@ -129,7 +129,7 @@ func TestRoutingTable(t *testing.T) {
 
 func TestRoutingTableConcurrency(t *testing.T) {
 	// Create a test logger
-	logger := slog.Default()
+	logger := logger.New()
 
 	// Create test config with empty state dir (no snapshot loading)
 	cfg := &config.Config{
@@ -189,7 +189,7 @@ func TestRoutingTableConcurrency(t *testing.T) {
 
 func TestRouteUpdate(t *testing.T) {
 	// Create a test logger
-	logger := slog.Default()
+	logger := logger.New()
 
 	// Create test config with empty state dir (no snapshot loading)
 	cfg := &config.Config{