Stage 1: project skeleton, SQLite, migrations, HTTP server

- go mod init with chi, modernc.org/sqlite, golang.org/x/crypto
- Custom embedded migration runner (no CGO dependency)
- Config from TERDUT_ADDR / TERDUT_DB_PATH env vars
- chi router with /healthz endpoint
- Graceful shutdown on SIGINT/SIGTERM

cmd/terdut/main.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"context"
+	"log"
+	"net/http"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/yeniklas/terdut-server/internal/api"
+	"github.com/yeniklas/terdut-server/internal/config"
+	"github.com/yeniklas/terdut-server/internal/db"
+)
+
+func main() {
+	cfg := config.Load()
+
+	database, err := db.Open(cfg.DBPath)
+	if err != nil {
+		log.Fatalf("open db: %v", err)
+	}
+	defer database.Close()
+
+	if err := db.Migrate(database); err != nil {
+		log.Fatalf("migrate: %v", err)
+	}
+
+	router := api.NewRouter(database)
+
+	srv := &http.Server{
+		Addr:         cfg.Addr,
+		Handler:      router,
+		ReadTimeout:  15 * time.Second,
+		WriteTimeout: 15 * time.Second,
+		IdleTimeout:  60 * time.Second,
+	}
+
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	go func() {
+		log.Printf("listening on %s", cfg.Addr)
+		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			log.Fatalf("listen: %v", err)
+		}
+	}()
+
+	<-ctx.Done()
+	log.Println("shutting down")
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	if err := srv.Shutdown(shutdownCtx); err != nil {
+		log.Printf("shutdown: %v", err)
+	}
+}