feat: separate AGPL libraries and add dynamic WASM loading

- Add WASM settings page for configuring external AGPL modules
- Implement dynamic loading for PyMuPDF, Ghostscript, and CoherentPDF
- Add Cloudflare Worker proxy for serving WASM files with CORS
- Update all affected tool pages to check WASM availability
- Add showWasmRequiredDialog for missing module configuration

Documentation:
- Update README, licensing.html, and docs to clarify AGPL components
  are not bundled and must be configured separately
- Add WASM-PROXY.md deployment guide with recommended source URLs
- Rename "CPDF" to "CoherentPDF" for consistency

src/js/utils/cpdf-helper.ts

@@ -1,15 +1,35 @@
+import { WasmProvider } from './wasm-provider';
+
 let cpdfLoaded = false;
 let cpdfLoadPromise: Promise<void> | null = null;
 
-//TODO: @ALAM,is it better to use a worker to load the cpdf library?
-// or just use the browser version?
-export async function ensureCpdfLoaded(): Promise<void> {
+function getCpdfUrl(): string | undefined {
+  const userUrl = WasmProvider.getUrl('cpdf');
+  if (userUrl) {
+    const baseUrl = userUrl.endsWith('/') ? userUrl : `${userUrl}/`;
+    return `${baseUrl}coherentpdf.browser.min.js`;
+  }
+  return undefined;
+}
+
+export function isCpdfAvailable(): boolean {
+  return WasmProvider.isConfigured('cpdf');
+}
+
+export async function isCpdfLoaded(): Promise<void> {
   if (cpdfLoaded) return;
 
   if (cpdfLoadPromise) {
     return cpdfLoadPromise;
   }
 
+  const cpdfUrl = getCpdfUrl();
+  if (!cpdfUrl) {
+    throw new Error(
+      'CoherentPDF is not configured. Please configure it in WASM Settings.'
+    );
+  }
+
   cpdfLoadPromise = new Promise((resolve, reject) => {
     if (typeof (window as any).coherentpdf !== 'undefined') {
       cpdfLoaded = true;
@@ -18,13 +38,14 @@ export async function ensureCpdfLoaded(): Promise<void> {
     }
 
     const script = document.createElement('script');
-    script.src = import.meta.env.BASE_URL + 'coherentpdf.browser.min.js';
+    script.src = cpdfUrl;
     script.onload = () => {
       cpdfLoaded = true;
+      console.log('[CPDF] Loaded from:', script.src);
       resolve();
     };
     script.onerror = () => {
-      reject(new Error('Failed to load CoherentPDF library'));
+      reject(new Error('Failed to load CoherentPDF library from: ' + cpdfUrl));
     };
     document.head.appendChild(script);
   });
@@ -32,11 +53,7 @@ export async function ensureCpdfLoaded(): Promise<void> {
   return cpdfLoadPromise;
 }
 
-/**
- * Gets the cpdf instance, ensuring it's loaded first
- */
 export async function getCpdf(): Promise<any> {
-  await ensureCpdfLoaded();
+  await isCpdfLoaded();
   return (window as any).coherentpdf;
 }
-