feat: add premium glassmorphism landing page for API root

[diusazzad]

Description

This PR adds a premium, interactive HTML/CSS landing page to the root (/) of the FastAPI server. It features a modern dark theme, glassmorphism UI, animated background blobs, and quick links to the Swagger and ReDoc documentation.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Local manual testing (Verified UI loads correctly at http://localhost:8000/)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e2c438b6-54a6-4485-a235-d0455b96a14f

📥 Commits

Reviewing files that changed from the base of the PR and between d96c8f7 and 47bef05.

⛔ Files ignored due to path filters (1)

• __pycache__/main.cpython-313.pyc is excluded by !**/*.pyc

📒 Files selected for processing (3)

• main.py
• static/css/style.css
• templates/index.html

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