refactor: remove dead code identified by static analysis

[Divkix]

This PR removes dead code identified through comprehensive static analysis across the codebase.

Dead Code Removed

1. cloudflare/index.ts

• Removed unused type exports TPROptions and TPRResult (never imported from public API)

2. entries/app-ssr-entry.ts

• Removed unused collectStreamChunks function (defined but never called)

3. entries/pages-server-entry.ts

• Removed 3 unused i18n helper functions:
  • extractLocale - duplicate of functionality in pages-i18n.ts
  • detectLocaleFromHeaders - never called
  • parseCookieLocaleFromHeader - never called

4. routing/file-matcher.ts

• Removed export from DEFAULT_PAGE_EXTENSIONS (internal constant)
• Removed export from buildExtensionGlob (internal function)

5. routing/utils.ts

• Removed export from routePrecedence (only used internally by compareRoutes)
• Removed export from decodeRouteSegmentStrict (only used internally)

6. shims/internal/utils.ts

• Removed unused constants SP and ST (defined but never referenced)

Methodology

The dead code was identified by:

1. Searching for exported functions/constants/types that have no imports across the codebase
2. Identifying private functions that are defined but never called within their files
3. Cross-referencing each export against test files, entry points, and other source files

Impact

• 75 lines of dead code removed
• No functional changes - all removed code was genuinely unused
• Reduces bundle size and maintenance surface area

[pkg-pr-new]

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npm i https://pkg.pr.new/vinext@573

commit: d8fc66d