```

feat(gameplay): 更新防御关卡金币系统

- 修改金币显示文本格式，移除冒号分隔符
- 实现差异化金币奖励机制：小怪固定1金币，英雄/Boss单位固定5金币
- 添加战术倍率支持，确保最低1金币奖励
- 增加击杀日志输出功能
- 实现英雄/Boss单位识别逻辑，通过名称和角色数据进行判断
```

Assets/Shader/UIGoldText.shader

@@ -0,0 +1,95 @@
+Shader "UI/GoldTextGradient"
+{
+    Properties
+    {
+        [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
+        _Color ("Tint", Color) = (1,1,1,1)
+
+        _TopColor ("Top Gold Color", Color) = (1, 0.95, 0.6, 1)
+        _BottomColor ("Bottom Gold Color", Color) = (0.9, 0.65, 0.1, 1)
+
+        _StencilComp ("Stencil Comparison", Float) = 8
+        _Stencil ("Stencil ID", Float) = 0
+        _StencilOp ("Stencil Operation", Float) = 0
+        _StencilWriteMask ("Stencil Write Mask", Float) = 255
+        _StencilReadMask ("Stencil Read Mask", Float) = 255
+        _ColorMask ("Color Mask", Float) = 15
+    }
+
+    SubShader
+    {
+        Tags
+        {
+            "Queue"="Transparent"
+            "IgnoreProjector"="True"
+            "RenderType"="Transparent"
+            "PreviewType"="Plane"
+            "CanUseSpriteAtlas"="True"
+        }
+
+        Stencil
+        {
+            Ref [_Stencil]
+            Comp [_StencilComp]
+            Pass [_StencilOp]
+            ReadMask [_StencilReadMask]
+            WriteMask [_StencilWriteMask]
+        }
+
+        Cull Off
+        Lighting Off
+        ZWrite Off
+        ZTest [unity_GUIZTestMode]
+        Blend SrcAlpha OneMinusSrcAlpha
+        ColorMask [_ColorMask]
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "UnityCG.cginc"
+            #include "UnityUI.cginc"
+
+            struct appdata_t
+            {
+                float4 vertex   : POSITION;
+                float4 color    : COLOR;
+                float2 texcoord : TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float4 vertex   : SV_POSITION;
+                fixed4 color    : COLOR;
+                half2 texcoord  : TEXCOORD0;
+                float4 worldPosition : TEXCOORD1;
+            };
+
+            fixed4 _Color;
+            fixed4 _TopColor;
+            fixed4 _BottomColor;
+            sampler2D _MainTex;
+            float4 _MainTex_ST;
+
+            v2f vert(appdata_t IN)
+            {
+                v2f OUT;
+                OUT.worldPosition = IN.vertex;
+                OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);
+                OUT.texcoord = TRANSFORM_TEX(IN.texcoord, _MainTex);
+                
+                fixed4 gradColor = lerp(_BottomColor, _TopColor, saturate(IN.texcoord.y));
+                OUT.color = IN.color * _Color * gradColor;
+                return OUT;
+            }
+
+            fixed4 frag(v2f IN) : SV_Target
+            {
+                half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;
+                return color;
+            }
+            ENDCG
+        }
+    }
+}

Assets/Shader/UIGoldText.shader.meta

@@ -0,0 +1,9 @@
+fileFormatVersion: 2
+guid: DigbtiqpU3j8N90EVQowLtPtYegKsmpKHnqMN8cef2iB8C1BMWP2FoE=
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: