feat(zh-TW): add Traditional Chinese localization support (#503)

* feat(zh-TW): add Traditional Chinese localization support

Integrates comprehensive zh-TW locale files across UI, models, emails, and helpers.
Updates language mapping for Chinese (Traditional) and adds translations for various modules.
Establishes full Traditional Chinese support in the app.

* feat(locales): add zh-TW translations

Add comprehensive Traditional Chinese (zh-TW) translations for UI, defaults,
Doorkeeper, mailers, models, and views to provide full Taiwanese localization
and improve wording consistency.

Replace and update several existing zh-TW entries for clarity and consistency.
Also expose the Postgres port in the example compose for easier local
development and apply minor locale/typo/whitespace fixes.

* feat(locales): add zh-TW translations

Add Traditional Chinese (zh-TW) locale files across many views and settings
to provide Taiwanese localization. Introduce updated translations for
authentication, onboarding, settings, integrations (Plaid, SimpleFin,
Lunch Flow), accounts, reports, and various resource pages.

Remove or replace legacy locale files to align with the revamped i18n
structure and copy organization. This enables full zh-TW support for the UI.

* chore(docker): remove published Postgres port

Remove the published Postgres port mapping (5432) from the example
docker-compose file to avoid exposing the database to the host and to
prevent accidental port conflicts. Keeps the example more secure and
focused on internal service networking.

* docs(i18n): 統一 SimpleFIN 在繁體中文翻譯的大小寫

將 zh-TW 翻譯中所有出現的 "SimpleFin" 更新為品牌正確的 "SimpleFIN"，
包含標題、提示文字、成功/錯誤訊息及表單標籤，以維持品牌名稱一致性
並提升使用者介面的翻譯準確性。

config/locales/views/users/zh-TW.yml

@@ -0,0 +1,17 @@
+---
+zh-TW:
+  users:
+    destroy:
+      success: 您的帳號已刪除。
+    update:
+      email_change_failed: 變更電子郵件地址失敗。
+      email_change_initiated: 請檢查您的新電子郵件信箱以獲取驗證說明。
+      success: 您的個人資料已更新。
+    resend_confirmation_email:
+      success: 新的驗證郵件已排入傳送佇列。
+      no_pending_change: 目前沒有待處理的電子郵件變更請求！
+    reset:
+      success: 您的帳號已重設。資料將在一段時間後於背景進行刪除。
+      unauthorized: 您沒有權限執行此操作。
+    reset_with_sample_data:
+      success: 您的帳號已重設，範例資料正在準備中。您很快就會看到示範資料。