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/server/server.go

@@ -4,12 +4,12 @@ package server
 import (
 	"context"
 	"encoding/json"
-	"log/slog"
 	"net/http"
 	"os"
 	"time"
 
 	"git.eeqj.de/sneak/routewatch/internal/database"
+	"git.eeqj.de/sneak/routewatch/internal/logger"
 	"git.eeqj.de/sneak/routewatch/internal/routingtable"
 	"git.eeqj.de/sneak/routewatch/internal/streamer"
 	"git.eeqj.de/sneak/routewatch/internal/templates"
@@ -23,12 +23,12 @@ type Server struct {
 	db           database.Store
 	routingTable *routingtable.RoutingTable
 	streamer     *streamer.Streamer
-	logger       *slog.Logger
+	logger       *logger.Logger
 	srv          *http.Server
 }
 
 // New creates a new HTTP server
-func New(db database.Store, rt *routingtable.RoutingTable, streamer *streamer.Streamer, logger *slog.Logger) *Server {
+func New(db database.Store, rt *routingtable.RoutingTable, streamer *streamer.Streamer, logger *logger.Logger) *Server {
 	s := &Server{
 		db:           db,
 		routingTable: rt,