first commit

backend/F9WebAiTest.Infrastructure/InterfaceImplements/Security/PasswordHasher.cs

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+using System.Security.Cryptography;
+using System.Text;
+using F9WebAiTest.Application.Interfaces.Security;
+
+namespace F9WebAiTest.Infrastructure.InterfaceImplements.Security;
+
+/// <summary>密码哈希服务实现（BCrypt）</summary>
+public class PasswordHasher : IPasswordHasher
+{
+    public string Hash256(string input)
+    {
+        var bytes = SHA256.HashData(Encoding.UTF8.GetBytes(input ?? ""));
+        return Convert.ToHexString(bytes).ToLowerInvariant();
+    }
+
+    public string GetMd5Hash(string input)
+    {
+        var bytes = MD5.HashData(Encoding.UTF8.GetBytes(input ?? ""));
+        return Convert.ToHexString(bytes).ToLowerInvariant();
+    }
+
+    public string HashPassword(string password)
+        => BCrypt.Net.BCrypt.HashPassword(password);
+
+    public bool VerifyPassword(string password, string hashedPassword)
+        => BCrypt.Net.BCrypt.Verify(password, hashedPassword);
+}

backend/F9WebAiTest.Infrastructure/InterfaceImplements/SnowflakeID/SnowflakeIdGenerator.cs

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+using F9WebAiTest.Application.Interfaces.SnowflakeID;
+
+namespace F9WebAiTest.Infrastructure.InterfaceImplements.SnowflakeID;
+
+/// <summary>
+/// 雪花 ID 生成器（自实现，41 时间戳 + 10 worker + 12 序列）。
+/// 参考 BBIT.F9.Infrastructure.InterfaceImplements.SnowflakeID.SnowflakeIdGenerator
+/// </summary>
+public class SnowflakeIdGenerator : ISnowflakeIdGenerator
+{
+    private readonly object _lock = new();
+    private readonly long _workerId;
+    private readonly long _epoch;
+    private long _lastTimestamp = -1L;
+    private long _sequence;
+
+    private const long WorkerIdBits = 10L;
+    private const long SequenceBits = 12L;
+    private const long WorkerIdShift = SequenceBits;
+    private const long TimestampShift = SequenceBits + WorkerIdBits;
+    private const long SequenceMask = -1L ^ (-1L << (int)SequenceBits);
+
+    public SnowflakeIdGenerator()
+    {
+        _workerId = 1; // 单节点默认 workerId = 1
+        _epoch = new DateTimeOffset(2025, 10, 1, 0, 0, 0, TimeSpan.Zero).ToUnixTimeMilliseconds();
+    }
+
+    public long CreateId()
+    {
+        lock (_lock)
+        {
+            var timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() - _epoch;
+            if (timestamp < _lastTimestamp)
+                throw new InvalidOperationException("时钟回拨，拒绝生成 ID");
+
+            if (timestamp == _lastTimestamp)
+            {
+                _sequence = (_sequence + 1) & SequenceMask;
+                if (_sequence == 0)
+                {
+                    // 序列溢出，等待下一毫秒
+                    while (timestamp <= _lastTimestamp)
+                        timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() - _epoch;
+                }
+            }
+            else
+            {
+                _sequence = 0;
+            }
+
+            _lastTimestamp = timestamp;
+
+            return (timestamp << (int)TimestampShift)
+                   | (_workerId << (int)WorkerIdShift)
+                   | _sequence;
+        }
+    }
+}