api: port api-beta fixes + add npm publish pipeline

[dnbrwstr]

Summary

• ports key runtime fixes from tloncorp/api-beta into monorepo packages/api
• adds npm publish infrastructure for @tloncorp/api (build, package shaping, workflow)

api-beta parity brought in

• formatScryPath now formats numeric segments as @ud (dot-separated)
• configureClient is async, supports injected client, and bootstraps connect+eventSource when getCode is provided
• Node cookie handling now strips Set-Cookie attributes before reuse
• fixes thread spider endpoint to include .json
• guards getTextContent against non-array content

publish infrastructure

• adds packages/api/tsconfig.build.json (emit JS + d.ts, excludes tests)
• adds packages/api/scripts/prepare-publish.mjs to generate dist/package.json for npm
• adds package scripts: build, clean, prepack, pack:dry-run
• adds packages/api/README.md
• adds workflow .github/workflows/publish-api.yml
  • manual trigger (dry_run option)
  • tag trigger (api-v*)
  • validates tag version == package version
  • typecheck/tests/builds and publishes from packages/api/dist

Validation

• pnpm --filter @tloncorp/api tsc
• pnpm --filter @tloncorp/api test
• pnpm --filter @tloncorp/api prepack
• pnpm -r tsc
• pnpm -r lint (warnings only)

Notes

• kept standalone dependency constraints intact (no reintroduction of React Query/Expo deps)
• pnpm --filter @tloncorp/shared test run in local env fails due native better-sqlite3 ABI mismatch, not code-level regressions