Route scanner: map file paths to URL patterns

[qantrepreneur]

What to build

Implement the route scanner that reads the file system (or a provided file map) and converts file paths under /src/routes/ into URL patterns.

Conventions:

• routes/index.tsx → /
• routes/about.tsx → /about
• routes/blog/index.tsx → /blog
• routes/blog/[slug].tsx → /blog/:slug
• routes/products/[category]/[id].tsx → /products/:category/:id

Returns an array of route entries with the URL pattern, param names, and reference to the source file path.

Acceptance criteria

• Converts file paths to URL patterns correctly
• Extracts [param] segments into named parameters
• Handles index.tsx as the directory root
• Ignores non-route files (files not ending in .tsx)
• Returns sorted route entries (static routes before dynamic ones for matching priority)
• Unit tests for all path conventions including nested dynamic segments

Blocked by

• Core types: Context, SlotMap, TemplateRegistry, RouteMap #2