fix(web): add prompt cache affinity to canvas agent (#74)

Co-authored-by: Tiantianr <260026737+Tiantianr@users.noreply.github.com>

web/src/services/api/image.ts

@@ -7,6 +7,7 @@ import { buildImageReferencePromptText } from "@/lib/image-reference-prompt";
 import { channelRequest } from "@/services/api/custom-channel-relay";
 import { imageToDataUrl } from "@/services/image-storage";
 import type { ReferenceImage } from "@/types/image";
+import { withOpenAIPromptCacheKey } from "@/lib/openai-prompt-cache";
 
 export type AiTextMessage = {
     role: "system" | "user" | "assistant";
@@ -100,7 +101,7 @@ type GeminiPayload = {
     promptFeedback?: { blockReason?: string };
 };
 type GeminiStreamState = { buffer: string; text: string; toolCalls: ResponseToolCall[]; error?: string };
-type RequestOptions = { signal?: AbortSignal };
+type RequestOptions = { signal?: AbortSignal; promptCacheKey?: string };
 
 const QUALITY_BASE: Record<string, number> = {
     low: 1024,
@@ -945,13 +946,21 @@ export async function requestToolResponse(config: AiConfig, messages: ResponseIn
                 parallel_tool_calls: false,
             }, onDelta, options);
         }
-        return await requestStreamingResponse(requestConfig, {
-            model: requestConfig.model,
-            input: toResponseInput(withSystemMessage(requestConfig, messages)),
-            tools: tools.map(toResponseTool),
-            tool_choice: toolChoice,
-            parallel_tool_calls: false,
-        }, onDelta, options);
+        return await requestStreamingResponse(
+            requestConfig,
+            withOpenAIPromptCacheKey(
+                {
+                    model: requestConfig.model,
+                    input: toResponseInput(withSystemMessage(requestConfig, messages)),
+                    tools: tools.map(toResponseTool),
+                    tool_choice: toolChoice,
+                    parallel_tool_calls: false,
+                },
+                options?.promptCacheKey,
+            ),
+            onDelta,
+            options,
+        );
     } catch (error) {
         throw new Error(readAxiosError(error, "请求失败"));
     }