Add SEO features: sitemap, robots.txt, and JSON-LD data

[Dubemtopsite]

PR Description: feat(seo): Add Sitemap, Robots.txt, and JSON-LD Structured Data

Closes #23

This PR implements a comprehensive SEO and structured data setup for Wraith Protocol, including automated sitemap generation, crawl guidelines via robots.txt, rich JSON-LD schema objects, and page-specific metadata injection during the build process.

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🚀 Key Changes

1. 🤖 Crawl & Indexing Configuration

• Added public/robots.txt: Declares default crawler behaviors (allowing indexation on all routes) and points search engines to the location of the XML sitemap.

2. 🗺️ Automated Sitemap Generation

• Added scripts/sitemap.ts: A node script that scans the built production assets in dist/ and dynamically generates a sitemap.xml matching all active static routes (such as /, /blog, /compare, /faq, /privacy, /stellar, /use-cases).
• Output Targets: Writes sitemap.xml to both dist/ (for immediate hosting/deployment) and public/ (for version control and dev previews).

3. 🏷️ Structured Data (JSON-LD) & Page Metadata Patching

• Global Schema: Embedded global structured schemas inside index.html for search engines to recognize:
  • Organization: Represents Wraith Protocol (defining logo, site URL, and social presence).
  • SoftwareApplication: Represents the Wraith Protocol SDK (detailing package category, supported platforms, download URL on npm, and free licensing details).
• Dynamic Page Patching (scripts/og.ts):
  • Upgraded the OG card generator script to not only patch images, but also patch titles, descriptions, and breadcrumb structures dynamically on a per-page basis.
  • Injects a unique BreadcrumbList schema dynamically matching the hierarchy of the subpages (e.g. Home -> Stellar on the /stellar route).

4. ⚙️ Build Pipeline Integration & Documentation

• Updated package.json: Appended the sitemap script tsx scripts/sitemap.ts to the build script execution sequence, ensuring SEO artifacts are automatically built alongside distribution assets.
• Updated README.md: Added dedicated sections describing the updated build steps and documenting how robots.txt, sitemap.xml, and JSON-LD structures operate.

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🛠️ File-by-File Breakdown

• public/robots.txt [NEW]: Configures crawler directives and registers the sitemap path.
• public/sitemap.xml [NEW]: Static placeholder sitemap containing existing routes.
• scripts/sitemap.ts [NEW]: Compiles the list of production routes and outputs a fresh sitemap.
• index.html [MODIFY]: Added main Organization and SoftwareApplication JSON-LD schema blocks, plus a container script tag for the breadcrumbs.
• scripts/og.ts [MODIFY]: Expanded OG logic to patchMetadata including custom HTML page titles, description tags, and dynamic route breadcrumbs.
• package.json [MODIFY]: Runs scripts/sitemap.ts on standard build workflows.
• README.md [MODIFY]: Documented build pipeline additions and details about SEO metadata files.

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🧪 Verification & Testing

1. Run a clean production build:

   pnpm build

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[truthixify]

Clean merge. Sitemap + robots.txt + JSON-LD via scripts + README update + index.html SEO meta. Same-day delivery on yesterday's assignment. Thanks @Dubemtopsite.