fix(android): 编辑器改成整页显示，保存后回到刚才那条详情

原来编辑器是叠在工作区上的 Box，而详情抽屉/对话框是独立窗口，永远盖在它上面——用户只能看到编辑器的一条顶栏。改成编辑器替换整页；保存成功后父层记下 itemId，回到工作区由对应页面刷新并重新打开那条详情。取消则什么都不变。

android/app/src/main/java/com/dadao/task/MainActivity.kt

@@ -73,6 +73,10 @@ private fun AppRoot(joinUri: String?) {
     var unread by remember { mutableStateOf(0) }
     // 打开富文本编辑器时非空；关掉就恢复原来的界面
     var editing by remember { mutableStateOf<EditRequest?>(null) }
+    // 编辑器保存成功的那条：回到工作区后重新打开它的详情，然后清掉
+    var reopenItem by remember { mutableStateOf<String?>(null) }
+    // 上面那条是任务还是知识：决定回哪个页面去重开
+    var reopenKnowledge by remember { mutableStateOf(false) }
 
     // 有本地令牌就先静默校验一次：令牌过期/被吊销要退回登录页，而不是进了主页再崩。
     LaunchedEffect(screen) {
@@ -124,37 +128,12 @@ private fun AppRoot(joinUri: String?) {
         )
         Screen.Workspace -> {
             val ws = current
+            val request = editing
             if (ws == null) {
                 screen = Screen.Home
-            } else {
+            } else if (request != null) {
-                Box {
+                // 编辑器**替换**整页，而不是叠在上面：抽屉/对话框都是独立窗口，
-                    WorkspaceScaffold(
+                // 叠一层会被它们盖住，用户只能看到编辑器的一条边。
-                        workspace = ws,
-                        tab = tab,
-                        unread = unread,
-                        onTab = { tab = it },
-                        onBackHome = { screen = Screen.Home },
-                    ) {
-                        when (tab) {
-                            WorkspaceTab.Tasks -> TaskListScreen(
-                                api = api,
-                                workspace = ws,
-                                onEdit = { editing = it },
-                            )
-
-                            WorkspaceTab.Tickets -> TicketsScreen(api = api, workspace = ws)
-                            WorkspaceTab.Knowledge -> KnowledgeScreen(
-                                api = api,
-                                workspace = ws,
-                                onEdit = { editing = it },
-                            )
-
-                            WorkspaceTab.Members -> MembersScreen(api = api, workspace = ws)
-                        }
-                    }
-
-                    val request = editing
-                    if (request != null) {
                 RichTextEditorScreen(
                     api = api,
                     workspaceId = ws.id,
@@ -180,9 +159,41 @@ private fun AppRoot(joinUri: String?) {
                                 body = body,
                             )
                         }
+                        // 保存成功才标记"回到哪条"：取消退出不该改变任何界面状态。
+                        reopenItem = request.itemId
+                        reopenKnowledge = request.knowledge
                     },
-                            onClose = { editing = null },
+                    // saved 参数由编辑器给：true 时上面已经设过 reopenItem，
+                    // 这里只负责把编辑器收起来，回到工作区后由对应页面重开详情。
+                    onClose = { _ -> editing = null },
                 )
+            } else {
+                WorkspaceScaffold(
+                    workspace = ws,
+                    tab = tab,
+                    unread = unread,
+                    onTab = { tab = it },
+                    onBackHome = { screen = Screen.Home },
+                ) {
+                    when (tab) {
+                        WorkspaceTab.Tasks -> TaskListScreen(
+                            api = api,
+                            workspace = ws,
+                            onEdit = { editing = it },
+                            reopenItem = if (reopenItem != null && !reopenKnowledge) reopenItem else null,
+                            onReopened = { reopenItem = null },
+                        )
+
+                        WorkspaceTab.Tickets -> TicketsScreen(api = api, workspace = ws)
+                        WorkspaceTab.Knowledge -> KnowledgeScreen(
+                            api = api,
+                            workspace = ws,
+                            onEdit = { editing = it },
+                            reopenItem = if (reopenItem != null && reopenKnowledge) reopenItem else null,
+                            onReopened = { reopenItem = null },
+                        )
+
+                        WorkspaceTab.Members -> MembersScreen(api = api, workspace = ws)
                     }
                 }
             }

android/app/src/main/java/com/dadao/task/ui/KnowledgeScreen.kt

@@ -55,7 +55,14 @@ private fun docTypeLabel(type: String): String = when (type) {
 }
 
 @Composable
-fun KnowledgeScreen(api: Api, workspace: Workspace, onEdit: (EditRequest) -> Unit = {}) {
+fun KnowledgeScreen(
+    api: Api,
+    workspace: Workspace,
+    onEdit: (EditRequest) -> Unit = {},
+    /** 编辑器保存后要重新打开的那条。父层持有：编辑器打开时本页会被整体卸载。 */
+    reopenItem: String? = null,
+    onReopened: () -> Unit = {},
+) {
     val scope = rememberCoroutineScope()
     var tab by remember { mutableStateOf("draft") }
     var docs by remember { mutableStateOf<List<KnowledgeDoc>>(emptyList()) }
@@ -85,6 +92,14 @@ fun KnowledgeScreen(api: Api, workspace: Workspace, onEdit: (EditRequest) -> Uni
 
     LaunchedEffect(tab) { reload() }
 
+    // 从编辑器保存回来：本页是新建出来的，刷完列表再把那条详情重新打开。
+    LaunchedEffect(reopenItem) {
+        val target = reopenItem ?: return@LaunchedEffect
+        reload()
+        open = docs.firstOrNull { it.id == target }
+        onReopened()
+    }
+
     fun fail(e: Throwable) {
         val code = (e as? ApiException)?.code ?: 0
         message = verifyStatusCode(code).ifBlank { e.message ?: "操作没成功" }

android/app/src/main/java/com/dadao/task/ui/TaskDetailSheet.kt

@@ -68,6 +68,8 @@ fun TaskDetailSheet(
     onChanged: () -> Unit,
     /** 进富文本编辑器改正文。标题与状态留在抽屉里，只有正文要更大地方。 */
     onEdit: (ItemDetail) -> Unit = {},
+    /** 编辑器保存回来后变一次，抽屉据此重新拉数据——否则还显示保存前的旧正文。 */
+    refreshKey: Int = 0,
 ) {
     val sheet = rememberModalBottomSheetState(skipPartiallyExpanded = true)
     val scope = rememberCoroutineScope()
@@ -93,7 +95,7 @@ fun TaskDetailSheet(
         runCatching { api.me() }.onSuccess { meId = it.user.id }
     }
 
-    LaunchedEffect(itemId) { reload() }
+    LaunchedEffect(itemId, refreshKey) { reload() }
 
     fun fail(e: Throwable) {
         val code = (e as? ApiException)?.code ?: 0

android/app/src/main/java/com/dadao/task/ui/TaskListScreen.kt

@@ -51,7 +51,14 @@ private val views = listOf(
 )
 
 @Composable
-fun TaskListScreen(api: Api, workspace: Workspace, onEdit: (EditRequest) -> Unit = {}) {
+fun TaskListScreen(
+    api: Api,
+    workspace: Workspace,
+    onEdit: (EditRequest) -> Unit = {},
+    /** 编辑器保存后要重新打开的那条。父层持这个状态，因为编辑器打开时本页会被整体卸载。 */
+    reopenItem: String? = null,
+    onReopened: () -> Unit = {},
+) {
     val scope = rememberCoroutineScope()
     var view by remember { mutableStateOf("active") }
     var mode by remember { mutableStateOf("list") }
@@ -60,6 +67,7 @@ fun TaskListScreen(api: Api, workspace: Workspace, onEdit: (EditRequest) -> Unit
     var draft by remember { mutableStateOf("") }
     var query by remember { mutableStateOf("") }
     var openId by remember { mutableStateOf<String?>(null) }
+    var detailRefresh by remember { mutableStateOf(0) }
     var error by remember { mutableStateOf<String?>(null) }
 
     suspend fun reload() {
@@ -75,6 +83,15 @@ fun TaskListScreen(api: Api, workspace: Workspace, onEdit: (EditRequest) -> Unit
 
     LaunchedEffect(view, query) { reload() }
 
+    // 从编辑器保存回来：本页是新建出来的，先刷数据再把那一条详情重新打开。
+    LaunchedEffect(reopenItem) {
+        val target = reopenItem ?: return@LaunchedEffect
+        reload()
+        detailRefresh += 1
+        openId = target
+        onReopened()
+    }
+
     fun fail(e: Throwable) {
         val code = (e as? ApiException)?.code ?: 0
         error = verifyStatusCode(code).ifBlank { e.message ?: "操作没成功" }
@@ -193,10 +210,12 @@ fun TaskListScreen(api: Api, workspace: Workspace, onEdit: (EditRequest) -> Unit
             itemId = id,
             onClose = { openId = null },
             onChanged = { scope.launch { reload() } },
+            // 抽屉是独立窗口，关掉才能让编辑器显示在上层；保存回来后由父层重新打开。
             onEdit = {
                 openId = null
                 onEdit(EditRequest(it.id, it.title, it.bodyMd, it.version))
             },
+            refreshKey = detailRefresh,
         )
     }
 }

backend/app/config.py

@@ -71,6 +71,24 @@ class Settings(BaseSettings):
     # 30 分钟够一次阅读/编辑，过期后刷新页面会重新签发。
     attachment_url_ttl_seconds: int = 1800
 
+    # ── 知识检索（M3）──────────────────────────────────────
+    # 切片大小与重叠：中文一段 600 字大约 400~600 token，够表达一个完整片段；
+    # 重叠 80 字是为了不把跨段的话切断（检索命中时前后文还读得懂）。
+    chunk_max_chars: int = 600
+    chunk_overlap_chars: int = 80
+    # 嵌入向量提供方：
+    #   hash   —— 内置的字符 n-gram 哈希向量，离线可用、零依赖、可复现；
+    #             质量不如真模型，但能把"检索链路"跑通，且换模型时接口不变。
+    #   openai —— 任何 OpenAI 兼容的 /embeddings 端点（BYOK）。
+    embedding_provider: Literal["hash", "openai"] = "hash"
+    embedding_base_url: str = "https://api.deepseek.com/v1"
+    embedding_api_key: str | None = None
+    embedding_model: str = "text-embedding-3-small"
+    # 混合检索里向量与词法的权重。纯词法搜不到同义改写，纯向量搜不准专有名词，
+    # 所以默认各占一半，可用环境变量调。
+    search_vector_weight: float = 0.6
+    search_lexical_weight: float = 0.4
+
     # ── 知识库向量库（独立实例，M3 起用）───────────────────
     # 刻意与业务库分开放：fnsvr-01 上的 PG 没有 pgvector，也不该为了装扩展去动它；
     # 向量检索吃内存，和任务库挤在同一实例会互相拖累。