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/server/http.go

@@ -0,0 +1,32 @@
+package server
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+)
+
+func (s *Server) serveUntilShutdown() {
+	listenAddr := fmt.Sprintf(":%d", s.params.Config.Port)
+	s.httpServer = &http.Server{
+		Addr:           listenAddr,
+		ReadTimeout:    10 * time.Second,
+		WriteTimeout:   10 * time.Second,
+		MaxHeaderBytes: 1 << 20,
+		Handler:        s,
+	}
+
+	s.SetupRoutes()
+
+	s.log.Info("http begin listen", "listenaddr", listenAddr)
+	if err := s.httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		s.log.Error("listen error", "error", err)
+		if s.cancelFunc != nil {
+			s.cancelFunc()
+		}
+	}
+}
+
+func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	s.router.ServeHTTP(w, r)
+}