chore: 修复登录页与前端开发服务器配置

- vite dev server 端口改为 5000 并启用 strictPort，端口冲突时拒绝启动
- AGENTS.md 更新前端目录结构说明（移除已删除的 ERB/enterprise 目录）及端口文档
- v3 登录页精简：移除 useBranding/globalConfig 依赖，去掉忘记密码链接
- 中文登录表单翻译优化（Email → 电子邮件）

AGENTS.md

@@ -19,9 +19,6 @@ backend/      # Go backend (the Go module lives here)
   tests/      # e2e tests + test helpers
 frontend/     # Chatwoot Vue 3 frontend (vendored for customization)
   app/javascript/   # Vue SPA source (dashboard, widget, sdk, portal, superadmin)
-  app/views/        # ERB templates (vite-plugin-ruby entrypoint resolution)
-  config/vite.json  # Vite-Rails bridge config
-  enterprise/       # Enterprise edition frontend overlay
   package.json      # pnpm + Vite + Vue 3 toolchain
 deploy/       # Deployment artifacts
   docker/     # Dockerfile, Dockerfile.dev, docker-compose.{yml,dev,prod,test}.yml
@@ -145,7 +142,7 @@ Key decoupling changes:
 # From repo root — unified dev workflow
 pnpm install              # install all workspace deps
 pnpm dev:backend          # start Go backend (air hot-reload, port 3000)
-pnpm dev:frontend         # start Vite dev server (port 3036, proxies API to :3000)
+pnpm dev:frontend         # start Vite dev server (port 5000, proxies API to :3000)
 pnpm dev                  # start both concurrently
 
 # Frontend-only (from frontend/)
@@ -165,3 +162,15 @@ Default `CHATWOOT_DIR` points to `../frontend`.
 - Do not add Go files to `backend/scripts/legacy/` expecting them to be excluded — `go build ./...` compiles them; keep that directory for one-off scripts only.
 - Do not commit `.env`, `coverage.out`, `bin/`, or `tmp/`.
 - Do not rewrite git history or force-push without explicit instruction.
+
+
+<!-- CODEGRAPH_START -->
+## CodeGraph
+
+In repositories indexed by CodeGraph (a `.codegraph/` directory exists at the repo root), reach for it BEFORE grep/find or reading files when you need to understand or locate code:
+
+- **MCP tool** (when available): `codegraph_explore` answers most code questions in one call — the relevant symbols' verbatim source plus the call paths between them, including dynamic-dispatch hops grep can't follow. Name a file or symbol in the query to read its current line-numbered source. If it's listed but deferred, load it by name via tool search.
+- **Shell** (always works): `codegraph explore "<symbol names or question>"` prints the same output.
+
+If there is no `.codegraph/` directory, skip CodeGraph entirely — indexing is the user's decision.
+<!-- CODEGRAPH_END -->

frontend/app/javascript/dashboard/i18n/locale/zh_CN/login.json

@@ -2,8 +2,8 @@
   "LOGIN": {
     "TITLE": "登录到Chatwoot",
     "EMAIL": {
-      "LABEL": "Email",
-      "PLACEHOLDER": "实例 {'@'}companyname.com",
+      "LABEL": "电子邮件",
+      "PLACEHOLDER": "电子邮件",
       "ERROR": "请输入一个有效的电子邮件"
     },
     "PASSWORD": {

frontend/app/javascript/v3/views/login/Index.vue

@@ -1,13 +1,11 @@
 <script>
 // utils and composables
 import { login } from '../../api/auth';
-import { mapGetters } from 'vuex';
 import { useAlert } from 'dashboard/composables';
 import { required, email } from '@vuelidate/validators';
 import { useVuelidate } from '@vuelidate/core';
 import { SESSION_STORAGE_KEYS } from 'dashboard/constants/sessionStorage';
 import SessionStorage from 'shared/helpers/sessionStorage';
-import { useBranding } from 'shared/composables/useBranding';
 
 // components
 import SimpleDivider from '../../components/Divider/SimpleDivider.vue';
@@ -46,9 +44,7 @@ export default {
     authError: { type: String, default: '' },
   },
   setup() {
-    const { replaceInstallationName } = useBranding();
     return {
-      replaceInstallationName,
       v$: useVuelidate(),
     };
   },
@@ -84,7 +80,6 @@ export default {
     };
   },
   computed: {
-    ...mapGetters({ globalConfig: 'globalConfig/get' }),
     allowedLoginMethods() {
       return window.chatwootConfig.allowedLoginMethods || ['email'];
     },
@@ -227,14 +222,8 @@ export default {
 
 <template>
   <main
-    class="flex flex-col w-full min-h-screen py-20 bg-n-brand/5 dark:bg-n-background sm:px-6 lg:px-8"
+    class="flex flex-col items-center justify-center w-full min-h-screen bg-n-brand/5 dark:bg-n-background sm:px-6 lg:px-8"
   >
-    <section class="max-w-5xl mx-auto">
-      <h2 class="text-3xl font-medium text-center text-n-slate-12">
-        {{ replaceInstallationName($t('LOGIN.TITLE')) }}
-      </h2>
-    </section>
-
     <!-- MFA Verification Section -->
     <section v-if="mfaRequired" class="mt-11">
       <MfaVerification
@@ -300,17 +289,7 @@ export default {
             :placeholder="$t('LOGIN.PASSWORD.PLACEHOLDER')"
             :has-error="v$.credentials.password.$error"
             @input="v$.credentials.password.$touch"
-          >
-            <p v-if="!globalConfig.disableUserProfileUpdate">
-              <router-link
-                to="auth/reset/password"
-                class="text-sm text-link"
-                tabindex="4"
-              >
-                {{ $t('LOGIN.FORGOT_PASSWORD') }}
-              </router-link>
-            </p>
-          </FormInput>
+          />
           <NextButton
             lg
             type="submit"

frontend/vite.config.ts

@@ -83,7 +83,8 @@ export default defineConfig({
   // Dev server: SPA mode for dashboard + widget.html route
   server: {
     host: '0.0.0.0',
-    port: 3036,
+    port: 5000,
+    strictPort: true, // port conflict → refuse to start instead of auto-incrementing
     // Serve widget.html for /widget path (widget iframe), index.html for SPA routes
     historyApiFallback: {
       rewrites: [