Refactor web build process and update documentation

- Removed Node.js build artifacts from .gitignore and adjusted Makefile to reflect changes in web UI build process, now using server-rendered Go templates instead of React.
- Updated README to clarify the new web UI architecture and output formats, emphasizing the removal of the Node.js build step.
- Added a command to set the number of frames per render task in manager configuration, enhancing user control over rendering settings.
- Improved Gitea workflow by removing unnecessary npm install step, streamlining the CI process.

internal/manager/renderer.go

@@ -0,0 +1,104 @@
+package api
+
+import (
+	"fmt"
+	"html/template"
+	"net/http"
+	"strings"
+	"time"
+
+	authpkg "jiggablend/internal/auth"
+	"jiggablend/web"
+)
+
+type uiRenderer struct {
+	templates *template.Template
+}
+
+type pageData struct {
+	Title           string
+	CurrentPath     string
+	ContentTemplate string
+	PageScript      string
+	User            *authpkg.Session
+	Error           string
+	Notice          string
+	Data            interface{}
+}
+
+func newUIRenderer() (*uiRenderer, error) {
+	tpl, err := template.New("base").Funcs(template.FuncMap{
+		"formatTime": func(t time.Time) string {
+			if t.IsZero() {
+				return "-"
+			}
+			return t.Local().Format("2006-01-02 15:04:05")
+		},
+		"statusClass": func(status string) string {
+			switch status {
+			case "completed":
+				return "status-completed"
+			case "running":
+				return "status-running"
+			case "failed":
+				return "status-failed"
+			case "cancelled":
+				return "status-cancelled"
+			case "online":
+				return "status-online"
+			case "offline":
+				return "status-offline"
+			case "busy":
+				return "status-busy"
+			default:
+				return "status-pending"
+			}
+		},
+		"progressInt": func(v float64) int {
+			if v < 0 {
+				return 0
+			}
+			if v > 100 {
+				return 100
+			}
+			return int(v)
+		},
+		"derefInt": func(v *int) string {
+			if v == nil {
+				return ""
+			}
+			return fmt.Sprintf("%d", *v)
+		},
+		"derefString": func(v *string) string {
+			if v == nil {
+				return ""
+			}
+			return *v
+		},
+		"hasSuffixFold": func(value, suffix string) bool {
+			return strings.HasSuffix(strings.ToLower(value), strings.ToLower(suffix))
+		},
+	}).ParseFS(
+		web.GetTemplateFS(),
+		"templates/*.html",
+		"templates/partials/*.html",
+	)
+	if err != nil {
+		return nil, fmt.Errorf("parse templates: %w", err)
+	}
+	return &uiRenderer{templates: tpl}, nil
+}
+
+func (r *uiRenderer) render(w http.ResponseWriter, data pageData) {
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	if err := r.templates.ExecuteTemplate(w, "base", data); err != nil {
+		http.Error(w, "template render error", http.StatusInternalServerError)
+	}
+}
+
+func (r *uiRenderer) renderTemplate(w http.ResponseWriter, templateName string, data interface{}) {
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	if err := r.templates.ExecuteTemplate(w, templateName, data); err != nil {
+		http.Error(w, "template render error", http.StatusInternalServerError)
+	}
+}