fix: resolve i18n no-restricted-imports lint warnings (#8704)

## Summary

Fix all i18n `no-restricted-imports` lint warnings and upgrade rules
from `warn` to `error`.

## Changes

- **What**: Migrate Vue components from `import { t/d } from '@/i18n'`
to `const { t } = useI18n()`. Migrate non-component `.ts` files from
`useI18n()` to `import { t/d } from '@/i18n'`. Allow `st` import from
`@/i18n` in Vue components (it wraps `te`/`t` for safe fallback
translation). Remove `@deprecated` tag from `i18n.ts` global exports
(still used by `st` and non-component code). Upgrade both lint rules
from `warn` to `error`.

## Review Focus

- The `st` helper is intentionally excluded from the Vue component
restriction since it provides safe fallback translation needed for
custom node definitions.

Fixes #8701

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8704-fix-resolve-i18n-no-restricted-imports-lint-warnings-2ff6d73d365081ae84d8eb0dfef24323)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Amp <amp@ampcode.com>

src/services/customerEventsService.test.ts

@@ -31,8 +31,8 @@ vi.mock('@/stores/firebaseAuthStore', () => ({
   useFirebaseAuthStore: vi.fn(() => mockFirebaseAuthStore)
 }))
 
-vi.mock('vue-i18n', () => ({
-  useI18n: vi.fn(() => mockI18n)
+vi.mock('@/i18n', () => ({
+  d: mockI18n.d
 }))
 
 vi.mock('@/utils/typeGuardUtil', () => ({

src/services/customerEventsService.ts

@@ -1,9 +1,9 @@
 import type { AxiosError, AxiosResponse } from 'axios'
 import axios from 'axios'
 import { ref, watch } from 'vue'
-import { useI18n } from 'vue-i18n'
 
 import { getComfyApiBaseUrl } from '@/config/comfyApi'
+import { d } from '@/i18n'
 import { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'
 import type { components, operations } from '@/types/comfyRegistryTypes'
 import { isAbortError } from '@/utils/typeGuardUtil'
@@ -33,7 +33,6 @@ const customerApiClient = axios.create({
 export const useCustomerEventsService = () => {
   const isLoading = ref(false)
   const error = ref<string | null>(null)
-  const { d } = useI18n()
 
   watch(
     () => getComfyApiBaseUrl(),