fix: 完善 serve 模式 session 列表接口

- GET /session/:id 支持从磁盘历史记录 fallback，修复历史 session 404
- 过滤无意义的管理命令会话（/exit、/model、/login 等）
- 保留 /crewpilot:plan 等有意义的斜杠命令触发的会话

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/server/routes/session.ts

@@ -215,10 +215,26 @@ export function createSessionRoutes(
         }
       }
 
-      // 按最后活跃时间倒序
-      merged.sort((a, b) => (b.last_active_at ?? 0) - (a.last_active_at ?? 0))
+      // 过滤掉已知的无意义管理命令会话（用户直接输入后立即退出，没有实际对话内容）
+      const BORING_COMMANDS = new Set([
+        '/exit', '/quit', '/bye',
+        '/clear', '/reset',
+        '/model', '/models',
+        '/login', '/logout',
+        '/help', '/version',
+        '/compact',
+      ])
+      const filtered = merged.filter(s => {
+        const t = s.title.trim()
+        if (!t) return false
+        if (BORING_COMMANDS.has(t)) return false
+        return true
+      })
 
-      const sessions = merged.slice(offset, offset + limit)
+      // 按最后活跃时间倒序
+      filtered.sort((a, b) => (b.last_active_at ?? 0) - (a.last_active_at ?? 0))
+
+      const sessions = filtered.slice(offset, offset + limit)
       process.stderr.write(`[server:session] GET /session -> history=${historySessions.length} active=${handleMap.size} merged=${merged.length} returned=${sessions.length}\n`)
       return c.json({ sessions })
     })
@@ -256,16 +272,42 @@ export function createSessionRoutes(
 
       return c.json({ sessions })
     })
-    .get('/session/:sessionID', c => {
+    .get('/session/:sessionID', async c => {
       const id = c.req.param('sessionID')
       const handle = sessionManager.getSession(id)
-      if (!handle) throw notFound('session not found')
-      const info = handle.getInfo()
-      return c.json({
-        ...info,
-        message_count: handle.messageCount,
-        usage: handle.usage,
-      })
+      if (handle) {
+        const info = handle.getInfo()
+        return c.json({
+          ...info,
+          message_count: handle.messageCount,
+          usage: handle.usage,
+        })
+      }
+
+      // 内存中没有，从磁盘历史记录查找
+      try {
+        const history = await listSessionsImpl({ limit: 1000 })
+        const s = history.find(h => h.sessionId === id)
+        if (s) {
+          return c.json({
+            session_id: s.sessionId,
+            status: 'stopped',
+            cwd: s.cwd ?? '',
+            title: (s.customTitle ?? s.firstPrompt ?? s.summary) ?? '',
+            model: undefined,
+            permission_mode: undefined,
+            created_at: s.createdAt ?? 0,
+            last_active_at: s.lastModified ?? 0,
+            cost_usd: 0,
+            input_tokens: 0,
+            output_tokens: 0,
+            message_count: 0,
+            usage: { input_tokens: 0, output_tokens: 0 },
+          })
+        }
+      } catch {}
+
+      throw notFound('session not found')
     })
     .patch('/session/:sessionID', async c => {
       const id = c.req.param('sessionID')