go-pkgz / routegroup / 16851746891

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Fix path parameter extraction in ServeHTTP

Path parameters were not being populated when using mounted groups
because ServeHTTP was calling Handler() and invoking the handler
directly, bypassing ServeMux's routing which sets path parameters.

This change modifies ServeHTTP to let ServeMux handle the request
directly, ensuring path parameters are properly set while still
intercepting 404s for custom handling and applying global middlewares.

Added comprehensive tests for:
- Path parameters with Mount and Group (regression test)
- Remainder wildcards {path...}
- URL-encoded path parameters
- Middleware context preservation
- Methodless patterns
- Root bundle parameters
- HEAD requests with parameters

Related: #22

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