feat: connect Astro pages endpoints and navigation

[bompus]

Behavior

Astro page routes now link to their exact same-file components, while exported HTTP methods in .ts/.js endpoints link to their handlers. ALL is represented as ANY; helper/type exports and .mjs files do not create endpoints.

Anchor destinations and Astro.redirect produce navigation to local pages. The existing TSX parser distinguishes actual anchors from strings and non-href attributes; external URLs, spreads and comments do not produce invented navigation. Custom routing configuration, Markdown/MDX and client transition calls remain outside this change.

Validation

• Build and 195 focused WASM/control tests pass, including fresh compiled parse/resolver workers.
• Full native suite: 4,435 passed, 46 skipped.
• Page/API roots, imported handlers, add/edit/delete sync and newly introduced Astro projects are covered.
• Independent correctness and complexity review is clear.

Stacked on codex/remix-file-routes (PR #5).