fix: harden AI analysis and seed defaults

modules/ai/server/analysis.ts

@@ -269,7 +269,7 @@ export async function generateElderAiAnalysis(
     "recommendations[] 字段：title, priority(low|normal|high|urgent), rationale, suggestedNextStep, citationIds。",
     "citations[] 只返回你实际引用过的 citation 对象，citationIds 必须来自可用 citations。",
     knowledgeUnavailableReason ? `知识库检索不可用：${knowledgeUnavailableReason}。请在 dataGaps 中包含“知识库检索不可用，分析未使用内部知识库”。` : "",
-    `modelSummary 固定为 {"provider":"openai-compatible","chatModel":"${runtimeConfig.config.chatModel}","embeddingModel":"${runtimeConfig.config.embeddingModel}"}。`,
+    `modelSummary 固定为 {"provider":"openai-compatible","chatModel":"${runtimeConfig.config.chatModel}","knowledgeRetrieval":"keyword"}。`,
     `可用 citations：${JSON.stringify(citations)}`,
     `住民上下文：\n${residentContext.context.promptContext}`,
     `知识库片段：\n${knowledgeItems.map((item, index) => `[kb-${index + 1}] ${item.title}\n${item.content}`).join("\n\n") || "无"}`,