fix: 7 项 E2E Bug 修复 — Dashboard 404 / 记忆去重 / 记忆注入 / invoice_id / Prompt 版本

P0:
- BUG-H1: Dashboard 路由 /api/v1/stats/dashboard → /api/v1/admin/dashboard

P1:
- BUG-H2: viking_add 预检查 content_hash 去重，返回 "deduped" 状态；SqliteStorage 启动时回填已有条目 content_hash
- BUG-M5: saas-relay-client 发送前调用 viking_inject_prompt 注入跨会话记忆

P2:
- BUG-M1: PaymentResult 添加 invoice_id 字段，query_payment_status 返回 invoice_id
- BUG-M2: UpdatePromptRequest 添加内容字段，更新时自动创建新版本并递增 current_version
- BUG-M3: viking_find scope 参数文档化（设计行为，调用方需传 agent scope）
- BUG-M4: Dashboard 路由缺失已修复，handler 层 require_admin 已正确返回 403

P3 (确认已修复/非代码问题):
- BUG-L1: pain_seed_categories 已统一，无 pain_seeds 残留
- BUG-L2: pipeline_create 参数格式正确，E2E 测试方法问题

desktop/src/lib/saas-relay-client.ts

@@ -16,6 +16,39 @@ import { createLogger } from './logger';
 
 const log = createLogger('SaaSRelayGateway');
 
+// ---------------------------------------------------------------------------
+// Memory injection helper — injects relevant memories into system prompt
+// before sending to SaaS relay (mirrors MemoryMiddleware in Tauri kernel path)
+// ---------------------------------------------------------------------------
+
+/**
+ * Attempt to inject relevant memories into the system prompt via Tauri IPC.
+ * Falls back gracefully in non-Tauri contexts (browser mode).
+ */
+async function injectMemories(
+  agentId: string | undefined,
+  basePrompt: string,
+  userInput: string,
+): Promise<string> {
+  try {
+    // Dynamic import — only available in Tauri context
+    const { invoke } = await import('@tauri-apps/api/core');
+    const enhanced = await invoke<string>('viking_inject_prompt', {
+      agentId: agentId ?? 'default',
+      basePrompt,
+      userInput,
+      maxTokens: 500,
+    });
+    if (enhanced && enhanced !== basePrompt) {
+      log.debug('Memory injection succeeded for relay request');
+      return enhanced;
+    }
+  } catch {
+    // Non-Tauri context or viking not initialized — skip silently
+  }
+  return basePrompt;
+}
+
 // ---------------------------------------------------------------------------
 // Frontend DataMasking — mirrors Rust DataMasking middleware for SaaS Relay
 // ---------------------------------------------------------------------------
@@ -180,6 +213,17 @@ export function createSaaSRelayGatewayClient(
         ? [...history, { role: 'user' as const, content: maskedMessage }]
         : [{ role: 'user' as const, content: maskedMessage }];
 
+      // BUG-M5 fix: Inject relevant memories into system prompt via Tauri IPC.
+      // This mirrors the MemoryMiddleware that runs in the kernel path.
+      const enhancedSystemPrompt = await injectMemories(
+        opts?.agentId,
+        '',
+        message,
+      );
+      if (enhancedSystemPrompt) {
+        messages.unshift({ role: 'system', content: enhancedSystemPrompt });
+      }
+
       const model = getModel();
       if (!model) {
         callbacks.onError('No model available — please check SaaS relay configuration');