Feat/auth0 server import restructure

[Piyush-85]

Pure file restructure of src/server/ with no logic changes, in preparation for the @auth0/auth0-server-js migration. Code is relocated verbatim into per-domain folders; the only edits are import-path updates and extracting inline types into dedicated types.ts files that are re-exported so all existing import paths remain valid. Public API is unchanged.

Changes

• Moved auth-client.ts into its own folder; extracted module-level constants, helpers, error utilities, and inline types into separate files with the class kept whole.
• Split cookies.ts into chunks.ts (cookie plumbing) and encryption.ts (crypto, the future swap target).
• Grouped fetcher, proxy, and their types into a fetcher/ folder.
• Grouped DPoP utilities, retry logic, and types into the existing dpop/ folder.
• Moved session utility helpers and their tests into the session/ folder; extracted inline types from the session store files.
• Extracted inline types from the helpers/ handler files into a shared types.ts.
• Moved MFA utilities and their tests into the mfa/ folder.
• Moved next-compat.ts and its test into a new http/ folder.
• Moved feature-domain test files into their respective domain folders (passkey/, passwordless/, my-account/, connected-accounts/).
• Consolidated core server test files into src/server/tests/.
• Renamed src/test/ to src/test-fixtures/.

Testing

• npm run build passes
• npm run lint passes
• Full unit suite green (~1902 tests)
• Diff audit: all relocations are renames with identical content; only import paths changed

Checklist

• No breaking changes to public API
• No logic changes
• All tests pass

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