feat: 重构评估流程为内存状态管理并接入真实提交与报告接口

本次重构将评估草稿改为内存状态管理，移除本地存储草稿，新增评估流程内存状态模块；接入真实的账户资料获取、头像上传接口，新增账户缓存清理逻辑；重构评估提交逻辑，接入真实提交接口并返回评估ID；新增分析页和报告页的真实状态查询、报告获取功能；更新README文档，记录开发进度和接口状态。

services/assessment-flow.uts

@@ -0,0 +1,24 @@
+// 仅供当前填写页与确认页传递数据，不写本机存储、不发起云端保存。
+let currentToken = ''
+let currentInput: UTSJSONObject | null = null
+let submissionFingerprint = ''
+let submissionKey = ''
+
+export function clearAssessmentFlow(): void { currentToken = ''; currentInput = null; submissionFingerprint = ''; submissionKey = '' }
+// 只在本次流程内复用幂等键：网络超时可安全重试，修改提交内容时生成新键。
+export function assessmentRequestKey(token: string, fingerprint: string): string {
+    const signature = token + ':' + fingerprint
+    if (submissionFingerprint != signature || submissionKey.length == 0) {
+        submissionFingerprint = signature
+        submissionKey = 'assessment_' + Date.now().toString() + '_' + Math.random().toString(36).substring(2, 14)
+    }
+    return submissionKey
+}
+export function readAssessmentFlow(token: string): UTSJSONObject | null {
+    if (token.length == 0 || token != currentToken) { clearAssessmentFlow(); return null }
+    return currentInput
+}
+export function writeAssessmentFlow(token: string, input: UTSJSONObject): void {
+    if (token.length == 0) { clearAssessmentFlow(); return }
+    currentToken = token; currentInput = input
+}