feat(image): 以插件声明统一图片参数、尺寸选择与定价合同 (#760)

* feat(image): 图片参数 - 统一插件声明配置与生成合同

* docs(image): 图片参数 - 说明声明合同与验证边界

* fix(plugins): 图片声明 - 保留内联素材支持并同步制品文档

* fix(image): 参数合同 - 对齐审批意图和尺寸预检调用方

* fix(image): 调用链 - 保留公开意图并接通独立分辨率

* fix(image): 图片参数 - 补齐分辨率接线与目录价格投影

plugin-packages/google-gemini-image/docs/interface.md

@@ -81,6 +81,10 @@
 
 imageSize 只映射 1K/2K/4K；未知质量值（如视频清晰度 720）必须省略。多图输出由宿主按次创建，不映射 candidateCount。
 
+## 动态图片参数
+
+`contributes.providers[].imageParameters` 是渠道模型、前台模型与生成界面共用的参数合同。`name` 为稳定身份，`type`、`values`、`min/max/step`、`default` 描述输入；`models` 限定适用上游模型，`enabled` 为初始启用状态。只有 `pricing: true` 的启用字段允许作为价格条件；其他参数仍参与生成。渠道可收窄范围，绑定与计价资格由插件拥有。`binding` 映射到统一请求或插件自己的 `providerOptions` 命名空间。
+
 <!-- YINGCE_MANIFEST_CONTRACT_START -->
 ## Manifest 完整接口定义
 
@@ -91,7 +95,7 @@ imageSize 只映射 1K/2K/4K；未知质量值（如视频清晰度 720）必须
   "apiVersion": "yingce.plugin/v2",
   "id": "google-gemini-image",
   "name": "Google Gemini Image",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "author": "Google / 影策",
   "description": "Google Gemini Image 独立请求协议插件。",
   "documentation": "<当前插件的完整 documentation，由 README.md 与 docs/interface.md 拼接而成；为避免 JSON 递归，此处不重复展开正文。>",
@@ -130,6 +134,67 @@ imageSize 只映射 1K/2K/4K；未知质量值（如视频清晰度 720）必须
           "type": "google-api-key",
           "field": "apiKey"
         },
+        "imageParameters": [
+          {
+            "name": "size",
+            "label": "画幅比例",
+            "type": "string",
+            "binding": "aspectRatio",
+            "encoding": "ratio",
+            "values": [
+              "1:1",
+              "2:3",
+              "3:2",
+              "3:4",
+              "4:3",
+              "4:5",
+              "5:4",
+              "9:16",
+              "16:9",
+              "21:9"
+            ],
+            "default": "1:1"
+          },
+          {
+            "name": "imageResolution",
+            "label": "分辨率",
+            "type": "string",
+            "binding": "resolution",
+            "values": [
+              "1k",
+              "2k",
+              "4k"
+            ],
+            "default": "1k",
+            "pricing": true
+          },
+          {
+            "name": "count",
+            "label": "生成数量",
+            "type": "integer",
+            "binding": "imageCount",
+            "min": 1,
+            "max": 1,
+            "step": 1,
+            "default": 1
+          },
+          {
+            "name": "seed",
+            "label": "随机种子",
+            "type": "integer",
+            "binding": "providerOptions.gemini-image.seed",
+            "enabled": false
+          },
+          {
+            "name": "temperature",
+            "label": "随机程度",
+            "type": "number",
+            "binding": "providerOptions.gemini-image.temperature",
+            "min": 0,
+            "max": 2,
+            "enabled": false
+          }
+        ],
         "parameters": [
           {
             "name": "model",