feat: add crawlable camera pages and SEO discovery

[hoangsvit]

Mục tiêu

Bổ sung SEO technical + crawlable content cho camera-hcm.eplus.dev, tập trung vào việc giúp search engines và AI agents tìm thấy từng camera thay vì chỉ thấy một homepage phụ thuộc JavaScript.

Thay đổi chính

Crawlable camera pages

• Thêm camera.php?id={CamId} render server-side
• Title/description/canonical riêng cho từng camera
• Open Graph + Twitter metadata
• Schema.org JSON-LD cho từng camera page
• Related cameras cùng khu vực để tăng internal linking
• Nút share/copy link
• Auto refresh hình camera nhưng vẫn giữ nội dung HTML crawlable

Homepage SEO

• Canonical chính thức: https://camera-hcm.eplus.dev/
• Meta robots + improved description/title
• Open Graph/Twitter metadata
• WebApplication structured data
• Visible descriptive content cho crawler và user
• Internal link từ mỗi card sang detail page

Discovery

• robots.txt
• sitemap.xml sitemap index
• sitemap.php sinh URL homepage + toàn bộ camera
• favicon.svg
• manifest.webmanifest
• llms.txt
• agents.md

CI

• Update checkout action
• Lint toàn bộ PHP
• Validate sitemap URL count = camera count + homepage
• Validate canonical/structured-data/manifest anchors
• HTTP smoke test homepage, camera detail và sitemap

SEO rationale

Google recommends consistent canonical signals and sitemap discovery for canonical URLs, while structured data helps Google understand page content. This PR makes each camera a stable, crawlable canonical URL instead of relying on client-side rendering only.

Base: develop

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