feat(services): introduce DeesServiceLibLoader to lazy-load heavy client libraries from CDN and update components to use it

ts_web/elements/00group-workspace/dees-workspace-terminal-preview/dees-workspace-terminal-preview.ts

@@ -7,9 +7,10 @@ import {
   css,
   cssManager,
 } from '@design.estate/dees-element';
-import { Terminal } from 'xterm';
-import { FitAddon } from 'xterm-addon-fit';
+import type { Terminal } from 'xterm';
+import type { FitAddon } from 'xterm-addon-fit';
 import { themeDefaultStyles } from '../../00theme.js';
+import { DeesServiceLibLoader } from '../../../services/index.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -305,8 +306,15 @@ export class DeesWorkspaceTerminalPreview extends DeesElement {
     const domtoolsInstance = await this.domtoolsPromise;
     const isBright = domtoolsInstance.themeManager.goBrightBoolean;
 
-    // Create xterm terminal in read-only mode
-    this.terminal = new Terminal({
+    // Load xterm from CDN
+    const libLoader = DeesServiceLibLoader.getInstance();
+    const [xtermBundle, fitAddonBundle] = await Promise.all([
+      libLoader.loadXterm(),
+      libLoader.loadXtermFitAddon(),
+    ]);
+
+    // Create xterm terminal in read-only mode using CDN-loaded module
+    this.terminal = new xtermBundle.Terminal({
       convertEol: true,
       cursorBlink: false,
       disableStdin: true,
@@ -323,7 +331,7 @@ export class DeesWorkspaceTerminalPreview extends DeesElement {
       }
     });
 
-    this.fitAddon = new FitAddon();
+    this.fitAddon = new fitAddonBundle.FitAddon();
     this.terminal.loadAddon(this.fitAddon);
     this.terminal.open(container);
     this.fitAddon.fit();

ts_web/elements/00group-workspace/dees-workspace-terminal/dees-workspace-terminal.ts

@@ -10,8 +10,7 @@ import {
 } from '@design.estate/dees-element';
 import * as domtools from '@design.estate/dees-domtools';
 
-import { Terminal } from 'xterm';
-import { FitAddon } from 'xterm-addon-fit';
+import type { Terminal } from 'xterm';
 import { themeDefaultStyles } from '../../00theme.js';
 import type { IExecutionEnvironment } from '../../00group-runtime/index.js';
 import { WebContainerEnvironment } from '../../00group-runtime/index.js';
@@ -24,6 +23,7 @@ import type {
   ICreateTerminalTabOptions,
   TTerminalTabType,
 } from './interfaces.js';
+import { DeesServiceLibLoader } from '../../../services/index.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -495,6 +495,16 @@ export class DeesWorkspaceTerminal extends DeesElement {
       }
     );
 
+    // Load xterm from CDN
+    const libLoader = DeesServiceLibLoader.getInstance();
+    const [xtermBundle, fitAddonBundle] = await Promise.all([
+      libLoader.loadXterm(),
+      libLoader.loadXtermFitAddon(),
+    ]);
+
+    // Initialize tab manager with loaded modules
+    this.tabManager.setXtermModules(xtermBundle, fitAddonBundle);
+
     // Create default shell tab
     await this.createShellTab();
   }

ts_web/elements/00group-workspace/dees-workspace-terminal/terminal-tab-manager.ts

@@ -1,6 +1,7 @@
-import { Terminal } from 'xterm';
-import { FitAddon } from 'xterm-addon-fit';
+import type { Terminal, ITerminalOptions } from 'xterm';
+import type { FitAddon } from 'xterm-addon-fit';
 import type { ITerminalTab, ICreateTerminalTabOptions, TTerminalTabType } from './interfaces.js';
+import type { IXtermBundle, IXtermFitAddonBundle } from '../../../services/index.js';
 
 /**
  * Manages terminal tabs lifecycle and state
@@ -8,6 +9,17 @@ import type { ITerminalTab, ICreateTerminalTabOptions, TTerminalTabType } from '
 export class TerminalTabManager {
   private tabs: Map<string, ITerminalTab> = new Map();
   private tabCounter: number = 0;
+  private xtermBundle: IXtermBundle | null = null;
+  private xtermFitAddonBundle: IXtermFitAddonBundle | null = null;
+
+  /**
+   * Initialize the manager with loaded xterm modules.
+   * Must be called before creating tabs.
+   */
+  public setXtermModules(xtermBundle: IXtermBundle, fitAddonBundle: IXtermFitAddonBundle): void {
+    this.xtermBundle = xtermBundle;
+    this.xtermFitAddonBundle = fitAddonBundle;
+  }
 
   /**
    * Generate unique tab ID
@@ -96,11 +108,15 @@ export class TerminalTabManager {
    * Create a new tab instance
    */
   createTab(options: ICreateTerminalTabOptions, isBright: boolean): ITerminalTab {
+    if (!this.xtermBundle || !this.xtermFitAddonBundle) {
+      throw new Error('TerminalTabManager: xterm modules not initialized. Call setXtermModules() first.');
+    }
+
     const id = this.generateTabId();
     const type = options.type;
 
-    // Create xterm.js Terminal instance
-    const terminal = new Terminal({
+    // Create xterm.js Terminal instance using CDN-loaded module
+    const terminal = new this.xtermBundle.Terminal({
       convertEol: true,
       cursorBlink: true,
       theme: this.getTerminalTheme(isBright),
@@ -109,8 +125,8 @@ export class TerminalTabManager {
       lineHeight: 1.2,
     });
 
-    // Create FitAddon
-    const fitAddon = new FitAddon();
+    // Create FitAddon using CDN-loaded module
+    const fitAddon = new this.xtermFitAddonBundle.FitAddon();
     terminal.loadAddon(fitAddon);
 
     const tab: ITerminalTab = {