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/cli.go

@@ -0,0 +1,106 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+func Run(args []string) error {
+	if len(args) == 0 {
+		printUsage()
+		return nil
+	}
+
+	root, err := findProjectRoot()
+	if err != nil {
+		return err
+	}
+
+	switch args[0] {
+	case "init":
+		return runInit(root, args[1:])
+	case "posts":
+		return runPosts(root, args[1:])
+	case "tags":
+		return runTags(root, args[1:])
+	case "db":
+		return runDB(root, args[1:])
+	case "config":
+		return runConfig(root, args[1:])
+	case "build":
+		return runBuild(root, args[1:])
+	case "serve":
+		return runServe(root, args[1:])
+	case "dev":
+		return runDev(root, args[1:])
+	case "help", "-h", "--help":
+		printUsage()
+		return nil
+	default:
+		return fmt.Errorf("unknown command %q", args[0])
+	}
+}
+
+func runInit(root string, args []string) error {
+	fs := flag.NewFlagSet("init", flag.ContinueOnError)
+	fs.SetOutput(os.Stderr)
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+
+	dirs := []string{
+		"config",
+		defaultPostsDir,
+		defaultAssetsDir,
+		".osaet",
+		defaultAstroDir,
+		defaultBuildOutDir,
+	}
+	for _, dir := range dirs {
+		if err := os.MkdirAll(filepath.Join(root, dir), 0o755); err != nil {
+			return err
+		}
+	}
+
+	if err := writeFileIfMissing(filepath.Join(root, "config/site.yaml"), defaultSiteConfig()); err != nil {
+		return err
+	}
+	if err := writeFileIfMissing(filepath.Join(root, "config/local.example.yaml"), defaultLocalExampleConfig()); err != nil {
+		return err
+	}
+
+	fmt.Println("initialized local project structure")
+	return nil
+}
+
+func printUsage() {
+	fmt.Print(`osaetctl manages local blog content and static builds.
+
+Usage:
+  osaetctl init
+  osaetctl posts slug --title "My Post" [--summary "..."]
+  osaetctl posts new --title "My Post" [--slug my-post|--no-ai-slug] [--tag go] [--summary "..."] [--status draft]
+  osaetctl posts list [--status draft|published]
+  osaetctl posts show <slug>
+  osaetctl posts publish <slug>
+  osaetctl posts unpublish <slug>
+  osaetctl posts delete <slug>
+  osaetctl posts edit <slug>
+  osaetctl posts import [--db .osaet/osaet.db]
+  osaetctl posts export [--db .osaet/osaet.db] [--overwrite]
+  osaetctl posts diff [--db .osaet/osaet.db]
+  osaetctl posts sync [--from files|db|auto] [--yes] [--db .osaet/osaet.db]
+  osaetctl tags list [--all]
+  osaetctl db init [--path .osaet/osaet.db]
+  osaetctl db status [--path .osaet/osaet.db]
+  osaetctl config import [--db .osaet/osaet.db]
+  osaetctl config export [--db .osaet/osaet.db] [--overwrite]
+  osaetctl config diff [--db .osaet/osaet.db]
+  osaetctl config sync [--from file|db|auto] [--yes] [--db .osaet/osaet.db]
+  osaetctl dev [--host 127.0.0.1] [--port 4321]
+  osaetctl build
+  osaetctl serve [--host 127.0.0.1] [--port 4321] [--dir dist/site]
+`)
+}