feat: Implement Room Streaming System

- Add RoomStreamingManager to manage room loading and unloading based on player proximity.
- Create StreamingBudgetConfigSO for memory and performance budgeting of the streaming system.
- Introduce TransitionDirector to handle seamless and atmospheric fade transitions between rooms.
- Develop WorldGraph to represent room connectivity and facilitate neighbor queries and distance calculations.
- Implement RoomNode and RoomEdge classes to structure room data and connections.

Assets/_Game/Scripts/Editor/Addressables/AddressableRules.cs

@@ -57,6 +57,7 @@ namespace BaseGames.Editor
             ("SPL_",     "Config"),       // 法术配置 SO
             ("ABL_",     "Config"),       // 能力配置 SO
             ("MAP_",     "Config"),       // 地图数据 SO（AssetFolderSpec §4）
+            ("STR_",     "Config"),       // 流式加载配置 SO（StreamingBudgetConfigSO）
             ("Config/",  "Config"),       // 路径前缀配置（AssetFolderSpec §8.2）
             // ── 音频（AUD_BGM_ / AUD_SFX_ 必须在通配 AUD_ 之前）─────────────
             ("AUD_BGM_", "Audio_Music"),  // BGM 流式音频
@@ -79,6 +80,8 @@ namespace BaseGames.Editor
                 { AddressKeys.PrefabUIFloatingDmgText, new[] { AddressKeys.Labels.Poolable, AddressKeys.Labels.Preload } },
                 // FootstepCatalog 是首帧必须可用的配置
                 { AddressKeys.DataFootstepCatalog,    new[] { AddressKeys.Labels.Config, AddressKeys.Labels.Preload } },
+                // 流式加载预算配置，运行时初始化前必须可用
+                { AddressKeys.DataStreamingBudgetConfig, new[] { AddressKeys.Labels.Config, AddressKeys.Labels.Preload } },
             };
 
         // ── 前缀 → 标签列表 ─────────────────────────────────────────────────────
@@ -105,6 +108,7 @@ namespace BaseGames.Editor
             // ── 配置数据 ─────────────────────────────────────────────────────
             ("CHM_",      new[] { AddressKeys.Labels.Charms }),
             ("MAP_",      new[] { AddressKeys.Labels.Config }), // 地图数据 SO 为动态加载配置
+            ("STR_",      new[] { AddressKeys.Labels.Config }), // 流式加载配置 SO（StreamingBudgetConfigSO）
             ("Config/",   new[] { AddressKeys.Labels.Config }),
             // ── 技能 / 法术 / 能力 / 世界物件 / 持久化：无批量加载需求，不加 Label ──
             ("SKL_",      Array.Empty<string>()),