Add tm_server with SQLite, Svelte UI, and task-master TUI sync.

Introduces the web backend (auth, RBAC, project tokens, revisions),
YouTrack-or-taskmaster backend choice in the TUI, and a first-pass
embedded Svelte UI. The frontend is functional but needs a major rework.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/youtrack/client.go

@@ -516,6 +516,49 @@ func (c *Client) findProjectViaIssue(ctx context.Context, shortName string) (str
 	return issues[0].Project.ID, nil
 }
 
+// Project is a YouTrack project summary for the register/import UI.
+type Project struct {
+	ID        string
+	ShortName string
+	Name      string
+}
+
+// ListProjects lists admin-accessible projects (requires sufficient token scope).
+func (c *Client) ListProjects(ctx context.Context) ([]Project, error) {
+	if err := c.ensureAuth(); err != nil {
+		return nil, err
+	}
+	var all []Project
+	for page := 0; page < maxPages; page++ {
+		skip := page * defaultPageSize
+		u, err := url.Parse(c.base() + "/api/admin/projects")
+		if err != nil {
+			return nil, err
+		}
+		q := u.Query()
+		q.Set("fields", "id,shortName,name")
+		q.Set("$top", fmt.Sprintf("%d", defaultPageSize))
+		q.Set("$skip", fmt.Sprintf("%d", skip))
+		u.RawQuery = q.Encode()
+
+		var raw []struct {
+			ID        string `json:"id"`
+			ShortName string `json:"shortName"`
+			Name      string `json:"name"`
+		}
+		if err := c.doJSON(ctx, http.MethodGet, u.String(), nil, &raw); err != nil {
+			return nil, err
+		}
+		for _, p := range raw {
+			all = append(all, Project{ID: p.ID, ShortName: p.ShortName, Name: p.Name})
+		}
+		if len(raw) < defaultPageSize {
+			break
+		}
+	}
+	return all, nil
+}
+
 // IssueURL builds the browser URL for an issue.
 func (c *Client) IssueURL(idReadable string) string {
 	return c.base() + "/issue/" + idReadable