feat: add csharp solution to lc problem: No.3577 #4894
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Pull request overview
This PR adds a C# solution for LeetCode problem #3577 "Count the Number of Computer Unlocking Permutations". The solution implements a mathematical approach to count valid computer unlocking permutations based on complexity constraints.
- Implements the CountPermutations method using a factorial calculation with modular arithmetic
- Returns 0 when any computer has complexity less than or equal to the root computer
- Calculates (n-1)! mod (10^9 + 7) for valid cases
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