Add SEO metadata to API documentation pages

[Copilot]

Adds comprehensive SEO metadata to improve search engine indexing and social media sharing of CronOps API documentation.

Changes

/docs endpoint HTML (src/api/webapi.ts)

• Added standard SEO meta tags: description, keywords, author, viewport, theme-color, lang attribute
• Added Open Graph tags for Facebook/LinkedIn rich previews
• Added Twitter Card tags for enhanced Twitter sharing
• Updated page title to "CronOps API Documentation"

OpenAPI specification (src/api/openapi.ts)

• Added API description, contact info, and license metadata to info object
• Improved tag descriptions for better API documentation clarity
• Removed irrelevant "user" tag referencing swagger.io
• Fixed LICENSE URL to reference main branch instead of master

Before:

info: { title: "CronOps Web API", version: "1.0.0" }

After:

info: {
  title: "CronOps Web API",
  version: "1.0.0",
  description: "REST API for CronOps - A lightweight, cron-based file management...",
  contact: { name: "CronOps", url: "https://github.com/mtakla/cronops" },
  license: { name: "ISC", url: "https://github.com/mtakla/cronops/blob/main/LICENSE" }
}

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