Fix TypeScript declaration publishing

[andrei-hasna]

Summary

• generate root package declarations during build, reusing SDK declarations for the root export and emitting storage declarations
• add explicit ./storage types metadata and a prepack build hook so plain npm pack includes declarations from a clean checkout
• add package validation that checks packed metadata targets and relative declaration imports

Validation

• rm -rf dist && npm pack --dry-run --json
• bun run validate:pack
• npm publish --dry-run --json
• bun test
• ./node_modules/.bin/biome check package.json tsconfig.types.json scripts/build-types.ts scripts/validate-package.ts
• packed tarball consumer TypeScript checks for @hasna/logs and @hasna/logs/storage under NodeNext and Bundler
• Bun runtime package-name import smoke test

Review

• adversarial reviewer found direct clean npm pack bypassed validation; reconciled with prepack: bun run build and revalidated clean pack output
• remaining low risk: validator skips bare external declaration specifiers; current public exported declarations typecheck from packed consumers