fix(api,client): resolve missing OG metadata for short URLs and minif…

[SarthakDudhe]

Description

This PR resolves an issue where social media link previews (Open Graph metadata) were not correctly displaying for shared quote posts, especially when using shortened URLs or in production environments.

The fix addresses two root causes:

1. Backend Cast Error: Updated the getPost resolver to support finding posts by both standard ObjectId and short urlId (e.g., e_6A4M), preventing Cast to ObjectId failed errors.
2. Regex Hardening: Hardened the Edge Function's HTML replacement logic to robustly match meta tags even when they are minified by the build process (stripping whitespace and slashes).

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Chore (refactoring, documentation, or other non-functional changes)

Related Issue

Fixes #230

Checklist:

• I have read the Contributing Guidelines.
• My code follows the Code Style of this project.
• I have added tests that prove my fix is effective or that my feature works. See Testing Guidelines.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.

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[flyblackbox]

Thank you @SarthakDudhe for your great work! @Om7035 will review and provide feedback or merge