fix(router): allow empty route.path for correct catchAll ranking

[evenchange4]

Let's say you have a directory structure like this:

└── src
    └── routes
        ├── $
        │   ├── layout.js
        │   └── page.js
        ├── $symbol
	        ├── calc
	            ├── layout.js
	            └── page.js
        ├── home
        │   ├── layout.js
        │   └── page.js
        └── layout.js

Current

❌ Visit localhost:3000/symbol/calc, the src/routes/$/page will be rendered.

Expect

✅ Visit localhost:3000/symbol/calc, the src/routes/$symbol/calc/page should be exactly matched and rendered.

Root Cause

The rank of pathParser is not correct.