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/cli/build.go

@@ -0,0 +1,88 @@
+package cli
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+
+	"osaet/backend/internal/staticserver"
+)
+
+func runBuild(root string, args []string) error {
+	fs := flag.NewFlagSet("build", flag.ContinueOnError)
+	fs.SetOutput(os.Stderr)
+	siteDir := fs.String("site-dir", defaultAstroDir, "Astro project directory")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+
+	sitePath := *siteDir
+	if !filepath.IsAbs(sitePath) {
+		sitePath = filepath.Join(root, sitePath)
+	}
+
+	if _, err := os.Stat(filepath.Join(sitePath, "package.json")); err != nil {
+		return fmt.Errorf("Astro project not found at %s; run from repo root", *siteDir)
+	}
+
+	cmd := exec.Command("npm", "run", "build")
+	cmd.Dir = sitePath
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Stdin = os.Stdin
+	return cmd.Run()
+}
+
+func runDev(root string, args []string) error {
+	fs := flag.NewFlagSet("dev", flag.ContinueOnError)
+	fs.SetOutput(os.Stderr)
+	host := fs.String("host", "127.0.0.1", "host to bind")
+	port := fs.String("port", "4321", "port to listen on")
+	siteDir := fs.String("site-dir", defaultAstroDir, "Astro project directory")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+
+	sitePath := *siteDir
+	if !filepath.IsAbs(sitePath) {
+		sitePath = filepath.Join(root, sitePath)
+	}
+
+	if _, err := os.Stat(filepath.Join(sitePath, "package.json")); err != nil {
+		return fmt.Errorf("Astro project not found at %s; run `osaetctl init` first", *siteDir)
+	}
+
+	cmd := exec.Command("npm", "run", "dev", "--", "--host", *host, "--port", *port)
+	cmd.Dir = sitePath
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Stdin = os.Stdin
+	return cmd.Run()
+}
+
+func runServe(root string, args []string) error {
+	fs := flag.NewFlagSet("serve", flag.ContinueOnError)
+	fs.SetOutput(os.Stderr)
+	host := fs.String("host", "127.0.0.1", "host to bind")
+	port := fs.String("port", "4321", "port to listen on")
+	dir := fs.String("dir", defaultBuildOutDir, "static output directory")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+
+	staticDir := *dir
+	if !filepath.IsAbs(staticDir) {
+		staticDir = filepath.Join(root, staticDir)
+	}
+
+	if _, err := os.Stat(staticDir); err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return fmt.Errorf("static directory %s does not exist; run `osaetctl build` first", *dir)
+		}
+		return err
+	}
+	return staticserver.Serve(staticDir, *host, *port)
+}