Initial implementation of inventree

A small IT asset inventory system built around a nested folder tree,
matching the project brief: Go + html/template + Bootstrap 5 + vanilla JS,
SQLite storage (WAL, FKs, migrations), embedded templates/static assets,
single compiled binary.

- AJAX-driven inventory tree: lazy-loaded folder expansion with per-user
  persisted expand state, drag-and-drop move for folders/assets, safe
  delete-with-relocate-or-cascade confirmation, search with breadcrumbs.
- Assets: CRUD, duplicate, move, auto-generated IT-000001-style IDs,
  CSV import (with optional folder auto-create) and export.
- Admin-defined item types with custom fields (text/long_text/number/date/
  boolean/dropdown/url/ip_address).
- Configurable statuses, session-based auth (bcrypt, secure cookies),
  admin/user roles, user management.
- CLI: serve, version, database migrate, database backup; /healthz;
  graceful shutdown; Dockerfile/docker-compose/systemd unit; Go test suite.

internal/settings/settings.go

@@ -0,0 +1,49 @@
+// Package settings provides access to the application's key/value settings.
+package settings
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+)
+
+type Store struct{ db *sql.DB }
+
+func NewStore(db *sql.DB) *Store { return &Store{db: db} }
+
+func (s *Store) Get(ctx context.Context, key, fallback string) (string, error) {
+	var v string
+	err := s.db.QueryRowContext(ctx, `SELECT value FROM settings WHERE key = ?`, key).Scan(&v)
+	if errors.Is(err, sql.ErrNoRows) {
+		return fallback, nil
+	}
+	if err != nil {
+		return "", err
+	}
+	return v, nil
+}
+
+func (s *Store) Set(ctx context.Context, key, value string) error {
+	_, err := s.db.ExecContext(ctx,
+		`INSERT INTO settings (key, value, updated_at) VALUES (?, ?, strftime('%Y-%m-%dT%H:%M:%fZ','now'))
+		 ON CONFLICT(key) DO UPDATE SET value = excluded.value, updated_at = excluded.updated_at`,
+		key, value)
+	return err
+}
+
+func (s *Store) All(ctx context.Context) (map[string]string, error) {
+	rows, err := s.db.QueryContext(ctx, `SELECT key, value FROM settings`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := map[string]string{}
+	for rows.Next() {
+		var k, v string
+		if err := rows.Scan(&k, &v); err != nil {
+			return nil, err
+		}
+		out[k] = v
+	}
+	return out, rows.Err()
+}