refactor(attachment): 求解器留在 llm-deepseek，存储层只接收目标尺寸

ImageRequestPolicy 改为 ImageRequestTarget，只含目标宽、高和字节目标；dsh-attachment 删除 token-grid 投影联合和 tokenGridProjection，只保留提供方无关的 requestImageDimensions 与 longEdgeDimensions。v41 求解器回到 llm-deepseek 的 image-tokens.ts，新增 deepSeekRequestImageDimensions，resolveRequestImageTarget 为每张图算出目标并加 4096 单边上限；pi-ai 路由按自身像素预算推导目标。

按 review 意见修正：v41 计价 Note 里已删除常量的过期句子就地改写；ProjectedDimensions 登记到 attachment 子系统页与 type-equiv 清单；Note 区分发送尺寸与提供方补齐后的网格；短边取整的措辞改为「按路由预测」。

scripts/gen-cordis-catalog.ts

@@ -378,7 +378,8 @@ export const LINK_MAP: Readonly<Record<string, string>> = {
   SaveFileStreamAttachment: 'attachment.md',
   ImageAttachmentAccess: 'llm-streaming.md',
   ImageAttachmentRef: 'attachment.md',
-  ImageRequestPolicy: 'attachment.md',
+  ImageRequestTarget: 'attachment.md',
+  ProjectedDimensions: 'attachment.md',
   PromptContentPart: 'attachment.md',
   RequestImageAttachment: 'attachment.md',
   SaveImageAttachment: 'attachment.md',

scripts/type-equiv.manifest.json

@@ -1003,18 +1003,13 @@
     },
     {
       "doc": "docs/subsystems/attachment.md",
-      "symbol": "ImageRequestProjection",
+      "symbol": "ImageRequestTarget",
       "source": "packages/attachment/attachment/src/types.ts"
     },
     {
       "doc": "docs/subsystems/attachment.md",
-      "symbol": "TokenGridProjection",
-      "source": "packages/attachment/attachment/src/types.ts"
-    },
-    {
-      "doc": "docs/subsystems/attachment.md",
-      "symbol": "ImageRequestPolicy",
-      "source": "packages/attachment/attachment/src/types.ts"
+      "symbol": "ProjectedDimensions",
+      "source": "packages/attachment/attachment/src/request-projection.ts"
     },
     {
       "doc": "docs/subsystems/attachment.md",