docs: 完善数据模型设计

- 重命名 log_file 为 test_scenario（测试场景）
- 拆分维度表：tx_panel、tx_hardware、tx_software、rx_type
- 采用星型模型设计，消除数据冗余
- 为所有表添加软删除字段 is_deleted
- 更新关系说明，包含全局查询过滤器配置
- 更新 ER 图和查询示例

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/architecture/database/DbContext工厂.md

@@ -0,0 +1,122 @@
+# DbContext 工厂
+
+> 所属模块：[数据库切换支持](./概览.md)
+
+---
+
+## 1. 接口定义
+
+```csharp
+// Data/IDbContextFactory.cs
+using WCTDataMiner.Data;
+
+namespace WCTDataMiner.Data;
+
+public interface IDbContextFactory
+{
+    WctMinerDbContext CreateDbContext();
+}
+```
+
+---
+
+## 2. 工厂实现
+
+```csharp
+// Data/DbContextFactory.cs
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+
+namespace WCTDataMiner.Data;
+
+public class DbContextFactory : IDbContextFactory
+{
+    private readonly IConfiguration _configuration;
+
+    public DbContextFactory(IConfiguration configuration)
+    {
+        _configuration = configuration;
+    }
+
+    public WctMinerDbContext CreateDbContext()
+    {
+        var dbType = _configuration["Database:Type"]?.ToLower() ?? "sqlite";
+        var optionsBuilder = new DbContextOptionsBuilder<WctMinerDbContext>();
+
+        switch (dbType)
+        {
+            case "postgresql":
+            case "postgres":
+                var pgConnStr = BuildPostgreSqlConnectionString();
+                optionsBuilder.UseNpgsql(pgConnStr);
+                break;
+            
+            case "sqlite":
+            default:
+                var dbPath = _configuration["Database:Path"] ?? "./data/database/wctminer.db";
+                EnsureDirectoryExists(dbPath);
+                optionsBuilder.UseSqlite($"Data Source={dbPath}");
+                break;
+        }
+
+#if DEBUG
+        optionsBuilder.EnableSensitiveDataLogging();
+        optionsBuilder.EnableDetailedErrors();
+#endif
+
+        return new WctMinerDbContext(optionsBuilder.Options);
+    }
+
+    private string BuildPostgreSqlConnectionString()
+    {
+        var host = _configuration["Database:Host"] ?? "localhost";
+        var port = _configuration["Database:Port"] ?? "5432";
+        var name = _configuration["Database:Name"] ?? "wctminer";
+        var user = _configuration["Database:User"] ?? "postgres";
+        var password = _configuration["Database:Password"] ?? "";
+
+        return $"Host={host};Port={port};Database={name};Username={user};Password={password}";
+    }
+
+    private static void EnsureDirectoryExists(string dbPath)
+    {
+        var directory = Path.GetDirectoryName(dbPath);
+        if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
+        {
+            Directory.CreateDirectory(directory);
+        }
+    }
+}
+```
+
+---
+
+## 3. 依赖注入扩展
+
+```csharp
+// Extensions/ServiceCollectionExtensions.cs
+using Microsoft.Extensions.DependencyInjection;
+using WCTDataMiner.Data;
+
+namespace WCTDataMiner.Extensions;
+
+public static class ServiceCollectionExtensions
+{
+    public static IServiceCollection AddDatabaseServices(
+        this IServiceCollection services, 
+        IConfiguration configuration)
+    {
+        // 注册 DbContext 工厂
+        services.AddScoped<IDbContextFactory, DbContextFactory>();
+        
+        // 注册 DbContext（通过工厂创建）
+        services.AddScoped<WctMinerDbContext>(sp =>
+        {
+            var factory = sp.GetRequiredService<IDbContextFactory>();
+            return factory.CreateDbContext();
+        });
+
+        return services;
+    }
+}
+```