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/pymupdf-loader.ts

@@ -0,0 +1,87 @@
+import { WasmProvider } from './wasm-provider.js';
+
+let cachedPyMuPDF: any = null;
+let loadPromise: Promise<any> | null = null;
+
+export interface PyMuPDFInterface {
+  load(): Promise<void>;
+  compressPdf(
+    file: Blob,
+    options: any
+  ): Promise<{ blob: Blob; compressedSize: number }>;
+  convertToPdf(file: Blob, ext: string): Promise<Blob>;
+  extractText(file: Blob, options?: any): Promise<string>;
+  extractImages(file: Blob): Promise<Array<{ data: Uint8Array; ext: string }>>;
+  extractTables(file: Blob): Promise<any[]>;
+  toSvg(file: Blob, pageNum: number): Promise<string>;
+  renderPageToImage(file: Blob, pageNum: number, scale: number): Promise<Blob>;
+  getPageCount(file: Blob): Promise<number>;
+  rasterizePdf(file: Blob | File, options: any): Promise<Blob>;
+}
+
+export async function loadPyMuPDF(): Promise<any> {
+  if (cachedPyMuPDF) {
+    return cachedPyMuPDF;
+  }
+
+  if (loadPromise) {
+    return loadPromise;
+  }
+
+  loadPromise = (async () => {
+    if (!WasmProvider.isConfigured('pymupdf')) {
+      throw new Error(
+        'PyMuPDF is not configured. Please configure it in Advanced Settings.'
+      );
+    }
+    if (!WasmProvider.isConfigured('ghostscript')) {
+      throw new Error(
+        'Ghostscript is not configured. PyMuPDF requires Ghostscript for some operations. Please configure both in Advanced Settings.'
+      );
+    }
+
+    const pymupdfUrl = WasmProvider.getUrl('pymupdf')!;
+    const gsUrl = WasmProvider.getUrl('ghostscript')!;
+    const normalizedPymupdf = pymupdfUrl.endsWith('/')
+      ? pymupdfUrl
+      : `${pymupdfUrl}/`;
+
+    try {
+      const wrapperUrl = `${normalizedPymupdf}dist/index.js`;
+      const module = await import(/* @vite-ignore */ wrapperUrl);
+
+      if (typeof module.PyMuPDF !== 'function') {
+        throw new Error(
+          'PyMuPDF module did not export expected PyMuPDF class.'
+        );
+      }
+
+      cachedPyMuPDF = new module.PyMuPDF({
+        assetPath: `${normalizedPymupdf}assets/`,
+        ghostscriptUrl: gsUrl,
+      });
+
+      await cachedPyMuPDF.load();
+
+      console.log('[PyMuPDF Loader] Successfully loaded from CDN');
+      return cachedPyMuPDF;
+    } catch (error: any) {
+      loadPromise = null;
+      throw new Error(`Failed to load PyMuPDF from CDN: ${error.message}`);
+    }
+  })();
+
+  return loadPromise;
+}
+
+export function isPyMuPDFAvailable(): boolean {
+  return (
+    WasmProvider.isConfigured('pymupdf') &&
+    WasmProvider.isConfigured('ghostscript')
+  );
+}
+
+export function clearPyMuPDFCache(): void {
+  cachedPyMuPDF = null;
+  loadPromise = null;
+}