feat: improve tiny url behavior and user experience

[harshmishra2701]

Description

This PR introduces Flask UI and improves overall UX and project structure.

summary of changes:

• Added Recent URLs page
• Fixed incorrect numbering after delete
• Added header and footer
• Shows date-only (no timezone confusion)
• Refactored project folder structure for clarity
• fixed UI output
• Added Recursivezero logo in qr
  This PR improves developer experience, user experience, and makes the project API-ready.
  Fixes 🪡 [RTY-250001]: Update on Tiny URL #1

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

Manual testing performed:

• Flask UI tested locally

Test commands:

poetry run tiny dev

User interface

Test Configuration:

Browser: Chrome

Device: laptop

Toolchain:

• Python 3.10 / 3.11
• Flask
• MongoDB
• Poetry

Checklist

• My code follows the style guidelines of this project
• 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
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[recursivezero]

fixes;

Generate URL should be in one line
Checkbox should be checked by default
input box font size should be bigger shorten URL should not impose as input box

Validate URl and if its correct the show green tick or show error message below the input not on top; color should be red not the backgroubnd

[recursivezero]

header will be fix on all pages; on admin ; there is no Admin on header?

[recursivezero]

remove this radio option when uncheck and check generate; always generate QR of tiny url:

[harshmishra2701]

[harshmishra2701]

[harshmishra2701]