Add portfolio diversity analyzer feature

[IshitaPrajapati08]

Summary [required]

This PR introduces a Portfolio Diversity Analyzer that evaluates a user's completed projects and calculates a Portfolio Diversity Score based on coverage across different development domains.

The feature analyzes completed projects, identifies covered and missing skill areas, and provides project recommendations to help users build a more balanced portfolio. A portfolio dashboard has also been added to display the diversity score and analysis, making project recommendations more personalized and helping users identify learning gaps.

Closes #1236

Type of Change [required]

[x] Feature — adds new functionality
[x] Style — CSS or visual changes only, no logic change

What Was Changed [required]

What Was Changed

File	Change made
src/utils/portfolio_analyzer.py	Added Portfolio Diversity Analyzer logic.
src/routes/main_routes.py	Added Portfolio Analysis API endpoint.
src/static/script.js	Connected frontend with backend and rendered portfolio analysis.
src/templates/index.html	Added Portfolio Diversity dashboard section.
src/static/style.css	Styled the Portfolio Diversity dashboard.

How to Test This PR [required]

1. Clone this branch: git checkout your-branch-name
2. Install dependencies: pip install -r requirements.txt
3. Run the app: python app.py
4. Open http://127.0.0.1:5000 and...
5. Run the tests: python tests/test_basic.py

Screenshots (if UI change)

Notes for Reviewer

This PR introduces a Portfolio Diversity Analyzer that helps users evaluate the balance of their completed projects and encourages exploration of uncovered development domains through personalized recommendations.

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[IshitaPrajapati08]

Hi @komalharshita ,I've completed the implementation for this issue. Could you please review my PR when you get a chance? Thanks!

[komalharshita]

@IshitaPrajapati08 kindly resolve the merge conflicts

[IshitaPrajapati08]

Hi @komalharshita,
I've resolved the merge conflicts and updated the PR. Could you please review and merge it if everything looks good? Thank you!

[komalharshita]

Approved for merge!
Thanks for your contribution