Fixes the issue where Kim Seunghyun's PR #28 contained generic template text instead of reflecting the actual 16 algorithm problems he solved and committed.

Problem

PR #28 titled "김승현 / 2025-09-13 / 16문제" showed placeholder text like:

- **총 해결 문제 수**: X문제
- **플랫폼별 분포**: BOJ X문제, PGS X문제, LTC X문제
- **난이도별 분포**: 브론즈 X문제, 실버 X문제, 골드 X문제

## 🧩 해결한 문제 목록
- [BOJ] 문제명 (난이도) - 알고리즘 분류

However, analysis of the actual committed files revealed 16 specific BOJ problems with detailed implementations and comments.

Solution

1. Enhanced the general PR template (docs/pull_request_template.md) to include:

   • Support for higher difficulty tiers (Platinum, Diamond)
   • Structured problem categorization by difficulty
   • Learning summary section for educational value

2. Created a corrected template (docs/김승현_PR28_정정된_템플릿.md) specifically for Kim Seunghyun's contributions that accurately reflects:

   • 16 BOJ problems solved across multiple difficulty levels
   • Difficulty breakdown: Gold 1 (6), Gold 2 (4), Platinum 3 (1), Platinum 4 (2), Platinum 5 (3)
   • Algorithm focus areas: Segment trees, advanced mathematics, graph algorithms, data structures
   • Specific problems like BOJ 1019 (책 페이지), BOJ 5719 (거의 최단 경로), BOJ 11438 (LCA 2), etc.

Impact

• Provides accurate documentation of actual algorithmic achievements
• Serves as a reference template for future high-level problem submissions
• Maintains consistency between committed code and PR descriptions
• Helps track learning progress and algorithm mastery

The templates now properly showcase the substantial algorithmic work completed rather than displaying generic placeholders.

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