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

vite.config.ts

@@ -274,34 +274,6 @@ export default defineConfig(() => {
   }
 
   const staticCopyTargets = [
-    {
-      src: 'node_modules/@bentopdf/pymupdf-wasm/assets/*.wasm',
-      dest: 'pymupdf-wasm',
-    },
-    {
-      src: 'node_modules/@bentopdf/pymupdf-wasm/assets/*.js',
-      dest: 'pymupdf-wasm',
-    },
-    {
-      src: 'node_modules/@bentopdf/pymupdf-wasm/assets/*.whl',
-      dest: 'pymupdf-wasm',
-    },
-    {
-      src: 'node_modules/@bentopdf/pymupdf-wasm/assets/*.zip',
-      dest: 'pymupdf-wasm',
-    },
-    {
-      src: 'node_modules/@bentopdf/pymupdf-wasm/assets/*.json',
-      dest: 'pymupdf-wasm',
-    },
-    {
-      src: 'node_modules/@bentopdf/gs-wasm/assets/*.wasm',
-      dest: 'ghostscript-wasm',
-    },
-    {
-      src: 'node_modules/@bentopdf/gs-wasm/assets/*.js',
-      dest: 'ghostscript-wasm',
-    },
     {
       src: 'node_modules/embedpdf-snippet/dist/pdfium.wasm',
       dest: 'embedpdf',