feat: add submodule: [web-agent] and intergate docs into doc site

[chilingling]

【描述】

1. 增加 web-agent 子模块。
2. 集成web-agent 子模块文档到 opentiny 文档。

Summary by CodeRabbit

• New Features
  • Added web-agent as a new product in site navigation
  • Introduced web-agent documentation section with getting started guide, architecture design, and API reference resources
  • Web-agent now accessible via dedicated navigation tab alongside other products

[coderabbitai]

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Walkthrough

The pull request integrates a new web-agent product module into the documentation site by adding submodule configuration, updating navigation sidebars, extending product tabs in the header, and adding corresponding navigation mappings to handle routing and display logic.

Changes

Cohort / File(s)	Summary
Repository Setup .gitmodules, web-agent	Added web-agent submodule pointing to git@github.com:opentiny/web-agent.git and updated subproject commit reference.
Documentation Configuration .vitepress/config.mts	Introduced WebAgentSidebar constant with Chinese documentation sections (快速开始, 架构设计, API 参考) and wired it into site navigation with route rewrites for /web-agent/docs/ to /web-agent/guide/.
Layout & Theming .vitepress/theme/Layout.vue	Added redirect mappings for web-agent paths to /web-agent/guide/getting-started and updated doc title resolution logic to recognize web-agent alongside existing documentation sections.
Product Navigation .vitepress/theme/components/CustomHeader.vue	Expanded header tab width to 980px, added web-agent to product tab navigation, updated active tab recognition, and integrated web-agent into tab selection and route-change handlers.
Navigation Entities .vitepress/theme/entity/nav-tab.ts	Added WebAgentNavTab class extending NavTab and updated navTabClassMap and navPathMap to register web-agent navigation configuration.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 A web-agent arrives, with tabs so bright,
Sidebars configured, navigation set right,
Routes and redirects dance in the file,
Documentation flows with elegant style,
Welcome, dear agent, to this docs compile! 🌟

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Merge Conflict Detection	⚠️ Warning	❌ Merge conflicts detected (6 files): ⚔️ .gitmodules (content) ⚔️ .vitepress/config.mts (content) ⚔️ .vitepress/theme/Layout.vue (content) ⚔️ .vitepress/theme/components/CustomHeader.vue (content) ⚔️ .vitepress/theme/entity/nav-tab.ts (content) ⚔️ tiny-robot (content) These conflicts must be resolved before merging into dev.	Resolve conflicts locally and push changes to this branch.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main changes: adding a web-agent submodule and integrating its documentation into the site. It is specific, concise, and captures the primary objective despite a minor typo ('intergate' instead of 'integrate').
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/intergateWebAgentDoc

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