feat(desktop): 工业化升级 D —— 内容可信（Markdown 渲染 + 健康五灯全真）

- components/Markdown.tsx：零依赖、行级 Markdown 渲染（# 标题 / **粗** *斜* `码` /
  - 与 1. 列表 / > 引用 / --- 分隔 / 段落），流式安全（每 token 重渲染容忍残缺）。
  报告正文与运行输出从裸 <pre> 换成真排版，瞬间像份报告。
- 健康聚合：mcp-go 加 rag.Status() + health 工具（milvus/neo4j/embedding 就绪）；
  gateway GET /api/v1/health 聚合 gateway/nats/db/redis(本地) + milvus/neo4j(经 mcp-go)；
  health.ts 轮询 /health，TopBar 五盏灯（Gateway/DB/NATS/Milvus/Neo4j）从"灰=未知"变真实绿/红。

验证：浏览器(Preview)跑报告——正文以标题/有序列表/引用/分隔线/二级标题排版呈现；
五盏灯全绿（/health 返回 db/gateway/milvus/nats/neo4j/redis 全 true）。tsc + vite build + 后端 build 通过。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-desktop/frontend/src/components/Markdown.tsx

@@ -0,0 +1,112 @@
+import { type ReactNode } from "react";
+
+// 轻量 Markdown 渲染 —— 零依赖、行级解析，覆盖报告正文用到的子集：
+// # / ## / ### 标题、**粗** *斜* `码`、- 与 1. 列表、> 引用、--- 分隔、段落。
+// 流式安全：每个 token 重渲染，残缺语法也能容忍。
+
+// 行内：把一段文本切成 **粗** / *斜* / `码` / 纯文本节点。
+function inline(text: string, keyPrefix: string): ReactNode[] {
+  const out: ReactNode[] = [];
+  const re = /(\*\*([^*]+)\*\*|`([^`]+)`|\*([^*]+)\*)/g;
+  let last = 0;
+  let m: RegExpExecArray | null;
+  let i = 0;
+  while ((m = re.exec(text)) !== null) {
+    if (m.index > last) out.push(text.slice(last, m.index));
+    const key = `${keyPrefix}-${i++}`;
+    if (m[2] !== undefined) out.push(<strong key={key} className="font-semibold text-slate-100">{m[2]}</strong>);
+    else if (m[3] !== undefined) out.push(<code key={key} className="rounded bg-ink-800 px-1 py-0.5 font-mono text-[0.85em] text-accent-400">{m[3]}</code>);
+    else if (m[4] !== undefined) out.push(<em key={key} className="italic text-slate-300">{m[4]}</em>);
+    last = re.lastIndex;
+  }
+  if (last < text.length) out.push(text.slice(last));
+  return out;
+}
+
+export function Markdown({ text, className }: { text: string; className?: string }) {
+  const lines = text.replace(/\r\n/g, "\n").split("\n");
+  const blocks: ReactNode[] = [];
+  let para: string[] = [];
+  let list: { ordered: boolean; items: string[] } | null = null;
+  let k = 0;
+
+  const flushPara = () => {
+    if (para.length) {
+      blocks.push(
+        <p key={`p${k++}`} className="my-2 leading-relaxed text-slate-300">
+          {inline(para.join(" "), `p${k}`)}
+        </p>,
+      );
+      para = [];
+    }
+  };
+  const flushList = () => {
+    if (list) {
+      const items = list.items.map((it, idx) => (
+        <li key={idx} className="leading-relaxed text-slate-300">
+          {inline(it, `li${k}-${idx}`)}
+        </li>
+      ));
+      blocks.push(
+        list.ordered ? (
+          <ol key={`l${k++}`} className="my-2 ml-5 list-decimal space-y-1 marker:text-slate-500">{items}</ol>
+        ) : (
+          <ul key={`l${k++}`} className="my-2 ml-5 list-disc space-y-1 marker:text-slate-600">{items}</ul>
+        ),
+      );
+      list = null;
+    }
+  };
+
+  for (const raw of lines) {
+    const line = raw.trimEnd();
+    const h = /^(#{1,3})\s+(.*)$/.exec(line);
+    const ol = /^\d+\.\s+(.*)$/.exec(line);
+    const ul = /^[-*]\s+(.*)$/.exec(line);
+
+    if (line.trim() === "") {
+      flushPara();
+      flushList();
+    } else if (/^(---|\*\*\*|___)\s*$/.test(line)) {
+      flushPara();
+      flushList();
+      blocks.push(<hr key={`hr${k++}`} className="my-3 border-line" />);
+    } else if (h) {
+      flushPara();
+      flushList();
+      const lvl = h[1].length;
+      const cls = lvl === 1 ? "mt-1 mb-3 text-xl font-bold text-slate-100" : lvl === 2 ? "mt-4 mb-2 text-base font-semibold text-slate-100" : "mt-3 mb-1 text-sm font-semibold text-slate-200";
+      const content = inline(h[2], `h${k}`);
+      blocks.push(lvl === 1 ? <h1 key={`h${k++}`} className={cls}>{content}</h1> : lvl === 2 ? <h2 key={`h${k++}`} className={cls}>{content}</h2> : <h3 key={`h${k++}`} className={cls}>{content}</h3>);
+    } else if (line.startsWith(">")) {
+      flushPara();
+      flushList();
+      blocks.push(
+        <blockquote key={`q${k++}`} className="my-2 border-l-2 border-brand/50 pl-3 text-sm text-slate-400">
+          {inline(line.replace(/^>\s?/, ""), `q${k}`)}
+        </blockquote>,
+      );
+    } else if (ol) {
+      flushPara();
+      if (!list || !list.ordered) {
+        flushList();
+        list = { ordered: true, items: [] };
+      }
+      list.items.push(ol[1]);
+    } else if (ul) {
+      flushPara();
+      if (!list || list.ordered) {
+        flushList();
+        list = { ordered: false, items: [] };
+      }
+      list.items.push(ul[1]);
+    } else {
+      flushList();
+      para.push(line);
+    }
+  }
+  flushPara();
+  flushList();
+
+  return <div className={className}>{blocks}</div>;
+}

sundynix-desktop/frontend/src/lib/health.ts

@@ -3,22 +3,38 @@ import { GATEWAY } from "./api";
 
 export interface Health {
   gateway: boolean;
-  persisted: boolean; // Postgres 是否在线（billing.persisted）
+  persisted: boolean; // Postgres（兼容旧字段名）
+  db: boolean;
+  redis: boolean;
+  nats: boolean;
+  milvus: boolean;
+  neo4j: boolean;
 }
 
-// useHealth 轮询 Gateway 健康（billing 端点同时回报持久化是否就绪）。
-// NATS/Milvus/Neo4j 暂未由网关透出，UI 以"未知"呈现（规划：加 /health 聚合）。
+const DOWN: Health = { gateway: false, persisted: false, db: false, redis: false, nats: false, milvus: false, neo4j: false };
+
+// useHealth 轮询 Gateway /health 聚合端点，回报全部依赖子系统的实时状态。
+// gateway/nats/db/redis 由网关本地判定，milvus/neo4j 经 mcp-go health 工具取。
 export function useHealth(intervalMs = 4000): Health {
-  const [h, setH] = useState<Health>({ gateway: false, persisted: false });
+  const [h, setH] = useState<Health>(DOWN);
   useEffect(() => {
     let alive = true;
     const ping = async () => {
       try {
-        const res = await fetch(`${GATEWAY}/api/v1/billing`);
-        const data = (await res.json()) as { persisted?: boolean };
-        if (alive) setH({ gateway: res.ok, persisted: Boolean(data.persisted) });
+        const res = await fetch(`${GATEWAY}/api/v1/health`);
+        const d = (await res.json()) as Partial<Health>;
+        if (alive)
+          setH({
+            gateway: res.ok && Boolean(d.gateway),
+            db: Boolean(d.db),
+            persisted: Boolean(d.db),
+            redis: Boolean(d.redis),
+            nats: Boolean(d.nats),
+            milvus: Boolean(d.milvus),
+            neo4j: Boolean(d.neo4j),
+          });
       } catch {
-        if (alive) setH({ gateway: false, persisted: false });
+        if (alive) setH(DOWN);
       }
     };
     ping();

sundynix-desktop/frontend/src/shell/TopBar.tsx

@@ -9,10 +9,10 @@ import { cn } from "../ui";
 const DRAG = { "--wails-draggable": "drag" } as CSSProperties;
 const NODRAG = { "--wails-draggable": "no-drag" } as CSSProperties;
 
-function Light({ on, label, unknown }: { on?: boolean; label: string; unknown?: boolean }) {
-  const dot = unknown ? "bg-slate-600" : on ? "bg-success shadow-[0_0_8px_rgba(52,211,153,0.7)]" : "bg-danger";
+function Light({ on, label }: { on: boolean; label: string }) {
+  const dot = on ? "bg-success shadow-[0_0_8px_rgba(52,211,153,0.7)]" : "bg-danger";
   return (
-    <span className="flex items-center gap-1.5 text-[11px] text-slate-500" title={unknown ? `${label}（状态未透出）` : label}>
+    <span className="flex items-center gap-1.5 text-[11px] text-slate-500" title={`${label} ${on ? "在线" : "离线"}`}>
       <span className={cn("h-1.5 w-1.5 rounded-full", dot)} />
       {label}
     </span>
@@ -46,10 +46,10 @@ export function TopBar({ identity, setIdentity }: { identity: Identity; setIdent
       </div>
       <div className="ml-2 flex items-center gap-3">
         <Light on={h.gateway} label="Gateway" />
-        <Light on={h.persisted} label="DB" />
-        <Light unknown label="NATS" />
-        <Light unknown label="Milvus" />
-        <Light unknown label="Neo4j" />
+        <Light on={h.db} label="DB" />
+        <Light on={h.nats} label="NATS" />
+        <Light on={h.milvus} label="Milvus" />
+        <Light on={h.neo4j} label="Neo4j" />
       </div>
       <div className="ml-auto flex items-center gap-2" style={NODRAG}>
         <div className="relative">

sundynix-desktop/frontend/src/views/ReportView.tsx

@@ -3,6 +3,7 @@ import { Play, Download, FileText, ExternalLink } from "lucide-react";
 import { generateReport, streamTokens, streamExec, reportDownloadUrl, type Identity, type ExecEvent } from "../lib/api";
 import { isDesktop, saveReportAs, openReport, notify } from "../lib/desktop";
 import { ExecTrace } from "../components/ExecTrace";
+import { Markdown } from "../components/Markdown";
 import { Button, Input, Field, Panel, Dot, EmptyState, useToast } from "../ui";
 
 // 安全文件名：去掉路径不安全字符，限长。
@@ -130,7 +131,7 @@ export function ReportView({ identity }: { identity: Identity }) {
           }
         >
           {out ? (
-            <pre className="whitespace-pre-wrap break-words font-sans text-sm leading-relaxed text-slate-300">{out}</pre>
+            <Markdown text={out} className="text-sm" />
           ) : (
             <EmptyState icon={FileText} title="尚未生成报告" desc="输入主题并点击「生成报告」，这里将实时显示规划与撰写过程。" />
           )}

sundynix-desktop/frontend/src/views/RunsView.tsx

@@ -1,5 +1,6 @@
 import { Activity, FileText } from "lucide-react";
 import { ExecTrace } from "../components/ExecTrace";
+import { Markdown } from "../components/Markdown";
 import { deriveNodes, type RunState } from "../lib/run";
 import { Panel, Dot, EmptyState } from "../ui";
 
@@ -42,7 +43,7 @@ export function RunsView({ run }: { run: RunState }) {
 
         <Panel title="模型输出" icon={FileText}>
           {run.output ? (
-            <pre className="whitespace-pre-wrap break-words font-sans text-sm leading-relaxed text-slate-300">{run.output}</pre>
+            <Markdown text={run.output} className="text-sm" />
           ) : (
             <EmptyState
               icon={Activity}