docs(pages): remove overview page across all languages and clean up references

- Delete en/zh/ja overview.md
- Remove overview imports, DocSlug entry and doc maps in index.ts
- Drop overview sidebar item and switch default slug to quickstart in DocsPage
- Remove overview-related i18n keys from en/zh/ja
- Sync viewer.md heading emphasis removal to en/ja

Author: lizhengfeng101

pages/src/content/docs/en/overview.md

@@ -166,7 +166,7 @@ The OpenTelemetry exporter is a separate concern — see
 [Telemetry](../telemetry/) for how to keep prompt content out of
 exported traces.
 
-## When the viewer is *not* the right tool
+## When the viewer is not the right tool
 
 - For programmatic post-processing (CI, dashboards), use
   `ocr review --format json --audience agent`. The viewer renders for

pages/src/content/docs/en/viewer.md

@@ -1,7 +1,6 @@
 /* Docs content index — imports all markdown files and provides a lookup by slug + language */
 
 // English docs
-import enOverview from './en/overview.md';
 import enQuickstart from './en/quickstart.md';
 import enInstallation from './en/installation.md';
 import enConfiguration from './en/configuration.md';
@@ -20,7 +19,6 @@ import enContributing from './en/contributing.md';
 import enFaq from './en/faq.md';
 
 // Chinese docs
-import zhOverview from './zh/overview.md';
 import zhQuickstart from './zh/quickstart.md';
 import zhInstallation from './zh/installation.md';
 import zhConfiguration from './zh/configuration.md';
@@ -39,7 +37,6 @@ import zhContributing from './zh/contributing.md';
 import zhFaq from './zh/faq.md';
 
 // Japanese docs
-import jaOverview from './ja/overview.md';
 import jaQuickstart from './ja/quickstart.md';
 import jaInstallation from './ja/installation.md';
 import jaConfiguration from './ja/configuration.md';
@@ -58,7 +55,6 @@ import jaContributing from './ja/contributing.md';
 import jaFaq from './ja/faq.md';
 
 export type DocSlug =
-  | 'overview'
   | 'quickstart'
   | 'installation'
   | 'configuration'
@@ -77,7 +73,6 @@ export type DocSlug =
   | 'faq';
 
 const enDocs: Record<DocSlug, string> = {
-  'overview': enOverview,
   'quickstart': enQuickstart,
   'installation': enInstallation,
   'configuration': enConfiguration,
@@ -97,7 +92,6 @@ const enDocs: Record<DocSlug, string> = {
 };
 
 const zhDocs: Record<DocSlug, string> = {
-  'overview': zhOverview,
   'quickstart': zhQuickstart,
   'installation': zhInstallation,
   'configuration': zhConfiguration,
@@ -117,7 +111,6 @@ const zhDocs: Record<DocSlug, string> = {
 };
 
 const jaDocs: Record<DocSlug, string> = {
-  'overview': jaOverview,
   'quickstart': jaQuickstart,
   'installation': jaInstallation,
   'configuration': jaConfiguration,

pages/src/content/docs/index.ts

@@ -139,7 +139,7 @@ JSONL トランスクリプトには、LLM に送信され LLM から受信し
 OpenTelemetry exporter は別の話です——prompt の内容をエクスポートされる trace に含めない方法については
 [テレメトリ](../telemetry/)を参照してください。
 
-## ビューアが*適さない*場合
+## ビューアが適さない場合
 
 - プログラムによる後処理（CI、ダッシュボード）には `ocr review --format json --audience agent` を使用します。
   ビューアは人間向けのレンダリングであり、機械向けではありません。

pages/src/content/docs/ja/overview.md

@@ -139,7 +139,7 @@ JSONL 转录包含发给 LLM 和从 LLM 收到的**一切**，包括 diff 中的
 OpenTelemetry exporter 是另一回事——如何让 prompt 内容不进入导出 trace 见
 [遥测](../telemetry/)。
 
-## 查看器*不*适用时
+## 查看器不适用时
 
 - 程序化后处理（CI、仪表盘）用 `ocr review --format json --audience agent`。
   查看器为人渲染，不为机器。

pages/src/content/docs/ja/viewer.md

@@ -100,23 +100,13 @@ export const en: TranslationKeys = {
 
   // Docs Page (keep existing)
   'docs.toc': 'Table of Contents',
-  'docs.overview': 'Overview',
   'docs.install': 'Install',
   'docs.config': 'ocr config',
   'docs.review': 'ocr review',
   'docs.scan': 'ocr scan',
   'docs.viewer': 'ocr viewer',
   'docs.mcp': 'MCP Server',
   'docs.env': 'Claude Code Integration',
-  'docs.overviewTitle': 'Overview',
-  'docs.overviewDesc': '(short <code>ocr</code>) is an AI-powered code review CLI tool.',
-  'docs.overviewFeatures': 'Core Features:',
-  'docs.overviewFeat1': 'Supports workspace, branch diff, single-commit, and full scan review modes',
-  'docs.overviewFeat2': 'Built-in Anthropic, OpenAI, DashScope, DeepSeek, Z.AI and custom provider support',
-  'docs.overviewFeat3': 'Concurrent review with customizable timeouts',
-  'docs.overviewFeat4': 'Output format supports text and json',
-  'docs.overviewFeat5': 'Zero config for Claude Code users',
-  'docs.overviewFeat6': 'WebUI viewer for visualizing review results',
   'docs.installTitle': 'Install',
   'docs.installLabel': 'Install',
   'docs.installVerifyLabel': 'Verify Installation',
@@ -269,7 +259,6 @@ export const en: TranslationKeys = {
   // Docs Sidebar
   'docs.sidebar.gettingStarted': 'Getting Started',
   'docs.sidebar.userGuide': 'User Guide',
-  'docs.sidebar.overview': 'Overview',
   'docs.sidebar.quickstart': 'QuickStart',
   'docs.sidebar.installation': 'Installation',
   'docs.sidebar.configuration': 'Configuration',