清理数据库迁移代码 + 保留历史报告

- 删除 DROP TABLE IF EXISTS SimulationReport（不再每次启动清空报告）
- 删除 4 个旧表 DROP 语句（SimTask/TargetConfig/DroneProfile/EquipmentDeployment）
- 删除 MetaEntry 版本追踪表和模型文件（开发阶段不需要）
- SeedDefaultData 改为简单判断：有数据就跳过，无数据就插入
- SeedDefaultScenarios 改为简单判断：有想定就跳过，无就种子
- 265 测试通过，Unity 编译通过

src/CounterDrone.Core/DatabaseManager.cs

@@ -50,17 +50,10 @@ namespace CounterDrone.Core
 
         private void SeedDefaultData(SQLiteConnection db)
         {
-            db.CreateTable<MetaEntry>();
+            if (db.Table<AmmunitionSpec>().Count() > 0)
-
-            var defaults = DefaultData.Load(_paths);
-            var currentVersion = db.Table<MetaEntry>()
-                .FirstOrDefault(m => m.Key == "defaultsVersion")?.Value;
-
-            // 版本未变且数据已存在 → 跳过
-            if (currentVersion == defaults.Version && db.Table<AmmunitionSpec>().Count() > 0)
                 return;
 
-            // 插入或更新默认数据（按 Id 覆盖，不删除用户自建数据）
+            var defaults = DefaultData.Load(_paths);
             foreach (var a in defaults.Ammunition) db.InsertOrReplace(a);
             foreach (var f in defaults.FireUnits) db.InsertOrReplace(f);
             foreach (var l in defaults.LaunchPlatforms) db.InsertOrReplace(l);
@@ -73,17 +66,12 @@ namespace CounterDrone.Core
                 r.WaypointsJson = System.Text.Json.JsonSerializer.Serialize(r.Waypoints);
                 db.InsertOrReplace(r);
             }
-
-            db.InsertOrReplace(new MetaEntry { Key = "defaultsVersion", Value = defaults.Version });
         }
 
         private void SeedDefaultScenarios(SQLiteConnection db)
         {
-            var currentVersion = db.Table<MetaEntry>()
+            if (db.Table<Scenario>().Count() > 0)
-                .FirstOrDefault(m => m.Key == "scenariosVersion")?.Value;
+                return;
-
-            // 版本未变 → 跳过
-            if (currentVersion == "5") return;
 
             var defaults = DefaultData.Load(_paths);
             var scenario = new ScenarioService(
@@ -93,19 +81,10 @@ namespace CounterDrone.Core
                 new RoutePlanRepository(db), new WaypointRepository(db));
 
             DefaultScenarios.Seed(scenario, defaults);
-
-            db.InsertOrReplace(new MetaEntry { Key = "scenariosVersion", Value = "5" });
         }
 
         private void CreateMainTables(SQLiteConnection db)
         {
-            // 删除旧版本残留表
-            db.Execute("DROP TABLE IF EXISTS SimTask");
-            db.Execute("DROP TABLE IF EXISTS TargetConfig");
-            db.Execute("DROP TABLE IF EXISTS DroneProfile");
-            db.Execute("DROP TABLE IF EXISTS EquipmentDeployment");
-            db.Execute("DROP TABLE IF EXISTS SimulationReport");
-
             db.CreateTable<ModelInfo>();
             db.CreateTable<AmmunitionSpec>();
             db.CreateTable<Scenario>();

src/CounterDrone.Core/Models/MetaEntry.cs

@@ -1,13 +0,0 @@
-using SQLite;
-
-namespace CounterDrone.Core.Models
-{
-    /// <summary>键值对元数据表（版本追踪等）</summary>
-    [Table("Meta")]
-    internal class MetaEntry
-    {
-        [PrimaryKey]
-        public string Key { get; set; } = string.Empty;
-        public string Value { get; set; } = string.Empty;
-    }
-}