feat(v0.1.4): Fix i18n imports + Default open registration

## Changes

### i18n Module Fixes
- Fix import paths in service.ts, languageSelector.tsx, header.tsx, base.tsx, results.tsx
- Change from '../i18n' to '../i18n/index' or './index' for proper module resolution

### Registration (Breaking Change)
- Change ACCOUNT_REGISTRATION default from false to true (out-of-box ready)
- Login and Register pages now both visible by default

### Version Bump
- Update package.json to v0.1.4
- Update CHANGELOG.md with v0.1.4 release notes
- Update README.md and docs with new version numbers

### Build Verification
- bun run build: PASSED
- Docker build: PASSED
- TypeScript compilation: PASSED (no errors)

src/helpers/env.ts

@@ -1,5 +1,6 @@
+// 預設開放註冊（開箱即用），管理者可設為 false 來關閉
 export const ACCOUNT_REGISTRATION =
-  process.env.ACCOUNT_REGISTRATION?.toLowerCase() === "true" || false;
+  process.env.ACCOUNT_REGISTRATION?.toLowerCase() !== "false";
 
 export const HTTP_ALLOWED = process.env.HTTP_ALLOWED?.toLowerCase() === "true" || false;