Add static site builder: SQLite-backed MD→HTML pipeline

- cmd/nebbet: CLI with build [--watch] and user add/passwd/delete/list
- internal/builder: markdown→HTML, component injection via HTML comments,
  auto importmap from lib/, fsnotify watch with 150ms debounce
- internal/db: meta.db (page index, tag queries) + search.db (FTS5)
- internal/sqlitedrv: minimal CGO database/sql driver for system libsqlite3
- internal/auth: htpasswd-compatible bcrypt password file management
- templates/base.html + admin.html, styles/main.css + admin.css
- nginx.conf with auth_basic for /admin, clean URLs, gzip
- nebbet.service systemd unit for watch daemon
- Example content/index.md and components/site-greeting.js

https://claude.ai/code/session_01HTc1BCBCiMTEB54XQP1Wz9

1 files changed, 49 insertions, 0 deletions

diff --git a/internal/builder/markdown.go b/internal/builder/markdown.go
new file mode 100644
index 0000000..4e00ca3
--- /dev/null
+++ b/internal/builder/markdown.go
@@ -0,0 +1,49 @@
+package builder
+
+import (
+	"bytes"
+	"regexp"
+	"strings"
+
+	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/extension"
+	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/renderer/html"
+)
+
+var md = goldmark.New(
+	goldmark.WithExtensions(
+		extension.GFM,
+		extension.Table,
+		extension.Strikethrough,
+		extension.TaskList,
+	),
+	goldmark.WithParserOptions(
+		parser.WithAutoHeadingID(),
+	),
+	goldmark.WithRendererOptions(
+		// Allow raw HTML pass-through so component tags survive round-trip.
+		html.WithUnsafe(),
+	),
+)
+
+// MarkdownToHTML converts a markdown string to an HTML fragment.
+func MarkdownToHTML(body string) (string, error) {
+	var buf bytes.Buffer
+	if err := md.Convert([]byte(body), &buf); err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
+
+var (
+	htmlTagRe   = regexp.MustCompile(`<[^>]+>`)
+	multiSpaceRe = regexp.MustCompile(`\s+`)
+)
+
+// StripHTML removes HTML tags and normalises whitespace for search indexing.
+func StripHTML(h string) string {
+	plain := htmlTagRe.ReplaceAllString(h, " ")
+	plain = multiSpaceRe.ReplaceAllString(plain, " ")
+	return strings.TrimSpace(plain)
+}