add agents to support route image

src/utils/SSEParser.transform.ts

@@ -0,0 +1,73 @@
+export class SSEParserTransform extends TransformStream<string, any> {
+    private buffer = '';
+    private currentEvent: Record<string, any> = {};
+
+    constructor() {
+        super({
+            transform: (chunk: string, controller) => {
+                const decoder = new TextDecoder();
+                const text = decoder.decode(chunk);
+                this.buffer += text;
+                const lines = this.buffer.split('\n');
+
+                // 保留最后一行（可能不完整）
+                this.buffer = lines.pop() || '';
+
+                for (const line of lines) {
+                    const event = this.processLine(line);
+                    if (event) {
+                        controller.enqueue(event);
+                    }
+                }
+            },
+            flush: (controller) => {
+                // 处理缓冲区中剩余的内容
+                if (this.buffer.trim()) {
+                    const events: any[] = [];
+                    this.processLine(this.buffer.trim(), events);
+                    events.forEach(event => controller.enqueue(event));
+                }
+
+                // 推送最后一个事件（如果有）
+                if (Object.keys(this.currentEvent).length > 0) {
+                    controller.enqueue(this.currentEvent);
+                }
+            }
+        });
+    }
+
+    private processLine(line: string, events?: any[]): any | null {
+        if (!line.trim()) {
+            if (Object.keys(this.currentEvent).length > 0) {
+                const event = { ...this.currentEvent };
+                this.currentEvent = {};
+                if (events) {
+                    events.push(event);
+                    return null;
+                }
+                return event;
+            }
+            return null;
+        }
+
+        if (line.startsWith('event:')) {
+            this.currentEvent.event = line.slice(6).trim();
+        } else if (line.startsWith('data:')) {
+            const data = line.slice(5).trim();
+            if (data === '[DONE]') {
+                this.currentEvent.data = { type: 'done' };
+            } else {
+                try {
+                    this.currentEvent.data = JSON.parse(data);
+                } catch (e) {
+                    this.currentEvent.data = { raw: data, error: 'JSON parse failed' };
+                }
+            }
+        } else if (line.startsWith('id:')) {
+            this.currentEvent.id = line.slice(3).trim();
+        } else if (line.startsWith('retry:')) {
+            this.currentEvent.retry = parseInt(line.slice(6).trim());
+        }
+        return null;
+    }
+}