Add project scaffolding with fx DI, SQLite migrations, and healthcheck

- go.mod with git.eeqj.de/sneak/chat module
- internal packages: globals, logger, config, db, healthcheck, middleware, handlers, server
- SQLite database with embedded migration system (schema_migrations tracking)
- Migration 001: schema_migrations table
- Migration 002: channels table
- Config with chat-specific vars (MAX_HISTORY, SESSION_TIMEOUT, MAX_MESSAGE_SIZE, MOTD, SERVER_NAME, FEDERATION_KEY)
- Healthcheck endpoint at /.well-known/healthcheck.json
- Makefile, .gitignore
- cmd/chatd/main.go entry point

internal/logger/logger.go

@@ -0,0 +1,65 @@
+package logger
+
+import (
+	"log/slog"
+	"os"
+
+	"git.eeqj.de/sneak/chat/internal/globals"
+	"go.uber.org/fx"
+)
+
+type LoggerParams struct {
+	fx.In
+	Globals *globals.Globals
+}
+
+type Logger struct {
+	log    *slog.Logger
+	level  *slog.LevelVar
+	params LoggerParams
+}
+
+func New(lc fx.Lifecycle, params LoggerParams) (*Logger, error) {
+	l := new(Logger)
+	l.level = new(slog.LevelVar)
+	l.level.Set(slog.LevelInfo)
+
+	tty := false
+	if fileInfo, _ := os.Stdout.Stat(); (fileInfo.Mode() & os.ModeCharDevice) != 0 {
+		tty = true
+	}
+
+	var handler slog.Handler
+	if tty {
+		handler = slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
+			Level:     l.level,
+			AddSource: true,
+		})
+	} else {
+		handler = slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
+			Level:     l.level,
+			AddSource: true,
+		})
+	}
+
+	l.log = slog.New(handler)
+	l.params = params
+
+	return l, nil
+}
+
+func (l *Logger) EnableDebugLogging() {
+	l.level.Set(slog.LevelDebug)
+	l.log.Debug("debug logging enabled", "debug", true)
+}
+
+func (l *Logger) Get() *slog.Logger {
+	return l.log
+}
+
+func (l *Logger) Identify() {
+	l.log.Info("starting",
+		"appname", l.params.Globals.Appname,
+		"version", l.params.Globals.Version,
+	)
+}