Initialize blog scaffold

Add the CLI, site, and sample content so the project can run locally.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/internal/staticserver/server.go

@@ -0,0 +1,45 @@
+package staticserver
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+)
+
+func Serve(dir string, host string, port string) error {
+	info, err := os.Stat(dir)
+	if err != nil {
+		return err
+	}
+	if !info.IsDir() {
+		return fmt.Errorf("static path %s is not a directory", dir)
+	}
+
+	addr := net.JoinHostPort(host, port)
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		path := filepath.Clean("/" + r.URL.Path)
+		if path == "/" {
+			path = "/index.html"
+		}
+
+		fullPath := filepath.Join(dir, filepath.FromSlash(path))
+		if info, err := os.Stat(fullPath); err == nil && info.IsDir() {
+			fullPath = filepath.Join(fullPath, "index.html")
+		} else if errors.Is(err, os.ErrNotExist) && filepath.Ext(fullPath) == "" {
+			fullPath = filepath.Join(dir, filepath.FromSlash(path), "index.html")
+		}
+
+		if _, err := os.Stat(fullPath); err != nil {
+			http.NotFound(w, r)
+			return
+		}
+
+		http.ServeFile(w, r, fullPath)
+	})
+
+	fmt.Printf("serving %s at http://%s\n", dir, addr)
+	return http.ListenAndServe(addr, handler)
+}