feat: Flexion 先验签后消费支付流程 + playerId 绑定

实现 Flexion 渠道支付验签重构：支付成功后不立即消费，将 purchaseJson/signature/purchaseToken
回调至 Unity，由服务端 SHA1withRSA 验签并校验 developerPayload.playerId 后再调用 consume。
同步更新 SDKManager 接口、UnityBridgeFunc 桥接、TYSdkModel 字段及 ExtraPluginCfgs。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

sdk-intergration/Assets/Scenes/SampleScene.unity

@@ -1964,6 +1964,85 @@ MonoBehaviour:
   m_OnClick:
     m_PersistentCalls:
       m_Calls: []
+--- !u!1 &783615086
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 783615087}
+  - component: {fileID: 783615089}
+  - component: {fileID: 783615088}
+  m_Layer: 5
+  m_Name: Title
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!224 &783615087
+RectTransform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 783615086}
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
+  m_Children: []
+  m_Father: {fileID: 1451597222}
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+  m_AnchorMin: {x: 0.5, y: 1}
+  m_AnchorMax: {x: 0.5, y: 1}
+  m_AnchoredPosition: {x: 0, y: -57}
+  m_SizeDelta: {x: 294.3188, y: 100}
+  m_Pivot: {x: 0.5, y: 0.5}
+--- !u!114 &783615088
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 783615086}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 5f7201a12d95ffc409449d95f23cf332, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  m_Material: {fileID: 0}
+  m_Color: {r: 0.8207547, g: 0.8207547, b: 0.8207547, a: 1}
+  m_RaycastTarget: 1
+  m_RaycastPadding: {x: 0, y: 0, z: 0, w: 0}
+  m_Maskable: 1
+  m_OnCullStateChanged:
+    m_PersistentCalls:
+      m_Calls: []
+  m_FontData:
+    m_Font: {fileID: 10102, guid: 0000000000000000e000000000000000, type: 0}
+    m_FontSize: 27
+    m_FontStyle: 0
+    m_BestFit: 0
+    m_MinSize: 0
+    m_MaxSize: 61
+    m_Alignment: 4
+    m_AlignByGeometry: 0
+    m_RichText: 1
+    m_HorizontalOverflow: 0
+    m_VerticalOverflow: 0
+    m_LineSpacing: 1
+  m_Text: GooglePlay
+--- !u!222 &783615089
+CanvasRenderer:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 783615086}
+  m_CullTransparentMesh: 1
 --- !u!1 &816060983
 GameObject:
   m_ObjectHideFlags: 0
@@ -4263,6 +4342,7 @@ RectTransform:
   m_LocalScale: {x: 0, y: 0, z: 0}
   m_ConstrainProportionsScale: 0
   m_Children:
+  - {fileID: 783615087}
   - {fileID: 2070325009}
   - {fileID: 1044920373}
   m_Father: {fileID: 0}
@@ -4968,6 +5048,7 @@ MonoBehaviour:
   _mfbShareLinkBtn: {fileID: 1240291501}
   _reviewBtn: {fileID: 678940591}
   _messageTxt: {fileID: 2070325010}
+  _titleText: {fileID: 783615088}
 --- !u!4 &1788702880
 Transform:
   m_ObjectHideFlags: 0
@@ -5417,7 +5498,7 @@ RectTransform:
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
   m_AnchorMin: {x: 0.5, y: 1}
   m_AnchorMax: {x: 0.5, y: 1}
-  m_AnchoredPosition: {x: 0, y: -120}
+  m_AnchoredPosition: {x: 0, y: -152}
   m_SizeDelta: {x: 800, y: 100}
   m_Pivot: {x: 0.5, y: 0.5}
 --- !u!114 &2070325010