refactor: Optimize package structure for smaller download size

- Remove outputs/ directory (example files not needed)
- Remove examples/ directory (moved to docs)
- Remove README.npm.md (consolidated into README.md)
- Add download-fonts.js for on-demand font downloads
- Update .npmignore to exclude fonts and examples
- Simplify README.md to be more concise
- Add postinstall.js for better setup experience
- Update package.json files field to reduce package size
- Add 'pto download-fonts' CLI command

Fonts are now downloaded on demand instead of bundled,
reducing npm package size from ~76MB to <1MB.

Author: Demo User

.npmignore

@@ -52,8 +52,16 @@ __pycache__/
 *.pyd
 .Python
 
-# Don't ignore these (will be included)
-!lib/
-!bin/
-!scripts/
-!assets/
+# Examples (too large)
+examples/
+
+# Font download cache (fonts are downloaded on install)
+assets/fonts/*.otf
+assets/fonts/*.ttf
+!assets/fonts/LICENSE.md
+
+# References
+references/
+
+# Outputs
+outputs/