Refactor problem architecture and add generic problem UI

[deepanshu-chaurasia29]

Summary

• Refactored the problem architecture into a generic problem system.
• Added dynamic problem rendering with Thymeleaf.
• Added CodeMirror-based Java editor with generic Run Tests functionality.
• Added Docker-based Java execution and testing.
• Added Bubble Sort, Two Sum, and Binary Search.
• Added dynamic array problem listing by category/type.
• Added hint and multiple-example support.
• Added generic problem-page styling.

Testing

• Bubble Sort: 7/7 tests passed
• Two Sum: 4/4 tests passed
• Binary Search: 5/5 tests passed
• mvn test passes

[deepanshu-chaurasia29]

@copilot resolve the merge conflicts in this pull request

[Copilot]

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[deepanshu-chaurasia29]

@copilot resolve the merge conflicts in this pull request.

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Security Rating on New Code (required ≥ A)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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