feat: initial scaffold with /healthz

Go module gitea.d-ma.be/mathias/gitea-mcp, minimal HTTP server with a
/healthz probe, Taskfile build targets, and .gitignore/README updates.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cmd/gitea-mcp/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"log/slog"
+	"net/http"
+	"os"
+)
+
+func main() {
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/healthz", func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte("ok"))
+	})
+
+	addr := ":8080"
+	logger.Info("gitea-mcp starting", "addr", addr)
+	if err := http.ListenAndServe(addr, mux); err != nil {
+		logger.Error("server stopped", "err", err)
+		os.Exit(1)
+	}
+}