fix(feishu): @所有人 (@all) no longer triggers every bot unconditionally

Previously checkBotMentioned() returned true for any message containing
'@_all', causing ALL bots in a Feishu group to respond simultaneously
whenever a user broadcast to @所有人 (#49761).

Fix: remove the unconditional @_all -> true early-return from
checkBotMentioned().  Opt-in is now controlled by a new respondToAtAll
config flag (boolean, default false) that can be set at the account level
(channels.feishu.respondToAtAll or channels.feishu.accounts.<id>.respondToAtAll)
or per-group (channels.feishu.groups.<chatId>.respondToAtAll).

The check is applied in handleFeishuMessage after groupConfig is resolved
so that per-group and per-account settings are both honoured.  Bots that
do not opt in remain silent when @所有人 is used, preserving the pre-existing
behaviour for single-bot deployments and groups that do not want broadcast
responses.

Changes:
- extensions/feishu/src/bot-content.ts: drop @_all -> true, add comment
- extensions/feishu/src/bot.ts: add respondToAtAll opt-in check after
  groupConfig is resolved, before the requireMention gate
- extensions/feishu/src/config-schema.ts: add respondToAtAll?:boolean to
  FeishuSharedConfigShape (account+global level) and FeishuGroupSchema
- extensions/feishu/src/bot.checkBotMentioned.test.ts: two new tests
  confirming mentionedBot=false for @_all via parseFeishuMessageEvent

extensions/feishu/src/bot-content.ts

@@ -248,9 +248,11 @@ export function checkBotMentioned(event: FeishuMessageLike, botOpenId?: string):
   if (!botOpenId) {
     return false;
   }
-  if ((event.message.content ?? "").includes("@_all")) {
-    return true;
-  }
+  // @_all (@所有人) is intentionally NOT treated as mentioning every bot here.
+  // Whether to respond to @所有人 is an opt-in decision controlled by the
+  // respondToAtAll config flag; the check is applied in handleFeishuMessage
+  // after the group config is resolved so that per-group and per-account
+  // settings are both honoured.
   const mentions = event.message.mentions ?? [];
   if (mentions.length > 0) {
     return mentions.some((mention) => mention.id.open_id === botOpenId);

extensions/feishu/src/bot.checkBotMentioned.test.ts

@@ -190,4 +190,25 @@ describe("parseFeishuMessageEvent – mentionedBot", () => {
     const ctx = parseFeishuMessageEvent(event as any, "ou_bot_123");
     expect(ctx.content).toBe("[Forwarded message: sc_abc123]");
   });
+
+  // @_all (@所有人) behaviour — opt-in is controlled by respondToAtAll config
+  // and resolved later in handleFeishuMessage; parseFeishuMessageEvent itself
+  // no longer unconditionally sets mentionedBot=true for @_all.
+  it("returns mentionedBot=false for @_all message (respondToAtAll opt-in not yet applied)", () => {
+    const event = makeEvent("group", [], "@_all hello everyone");
+    const ctx = parseFeishuMessageEvent(event as any, BOT_OPEN_ID);
+    expect(ctx.mentionedBot).toBe(false);
+  });
+
+  it("returns mentionedBot=false for @_all even when bot is also in mentions list (opt-in path takes precedence)", () => {
+    // Explicit bot mention still wins via the mentions array path
+    const event = makeEvent(
+      "group",
+      [{ key: "@_user_1", name: "Bot", id: { open_id: BOT_OPEN_ID } }],
+      "@_all hello",
+    );
+    const ctx = parseFeishuMessageEvent(event as any, BOT_OPEN_ID);
+    // Bot IS in the mentions array, so it should still be true via that path
+    expect(ctx.mentionedBot).toBe(true);
+  });
 });

extensions/feishu/src/bot.ts

@@ -418,6 +418,17 @@ export async function handleFeishuMessage(params: {
       groupConfig,
     }));
 
+    // @_all (@所有人) opt-in: if the message targets all group members and the
+    // account or group is explicitly configured with respondToAtAll:true, treat
+    // it as mentioning this bot.  Default is false so bots that do not opt in
+    // stay silent when a user broadcasts to the whole group.
+    if (!ctx.mentionedBot && (event.message.content ?? "").includes("@_all")) {
+      const respondToAtAll = groupConfig?.respondToAtAll ?? feishuCfg?.respondToAtAll ?? false;
+      if (respondToAtAll) {
+        ctx = { ...ctx, mentionedBot: true };
+      }
+    }
+
     if (requireMention && !ctx.mentionedBot) {
       log(`feishu[${account.accountId}]: message in group ${ctx.chatId} did not mention bot`);
       // Record to pending history for non-broadcast groups only. For broadcast groups,

extensions/feishu/src/config-schema.ts

@@ -141,6 +141,7 @@ const ReplyInThreadSchema = z.enum(["disabled", "enabled"]).optional();
 export const FeishuGroupSchema = z
   .object({
     requireMention: z.boolean().optional(),
+    respondToAtAll: z.boolean().optional(),
     tools: ToolPolicySchema,
     skills: z.array(z.string()).optional(),
     enabled: z.boolean().optional(),
@@ -164,6 +165,7 @@ const FeishuSharedConfigShape = {
   groupAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
   groupSenderAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
   requireMention: z.boolean().optional(),
+  respondToAtAll: z.boolean().optional(),
   groups: z.record(z.string(), FeishuGroupSchema.optional()).optional(),
   historyLimit: z.number().int().min(0).optional(),
   dmHistoryLimit: z.number().int().min(0).optional(),