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

package.json

@@ -64,8 +64,6 @@
     "vue": "^3.5.26"
   },
   "dependencies": {
-    "@bentopdf/gs-wasm": "^0.1.0",
-    "@bentopdf/pymupdf-wasm": "^0.11.12",
     "@fontsource/cedarville-cursive": "^5.2.7",
     "@fontsource/dancing-script": "^5.2.8",
     "@fontsource/dm-sans": "^5.2.8",