feat: per-channel responsePrefix override (#9001)

* feat: per-channel responsePrefix override

Add responsePrefix field to all channel config types and Zod schemas,
enabling per-channel and per-account outbound response prefix overrides.

Resolution cascade (most specific wins):
  L1: channels.<ch>.accounts.<id>.responsePrefix
  L2: channels.<ch>.responsePrefix
  L3: (reserved for channels.defaults)
  L4: messages.responsePrefix (existing global)

Semantics:
  - undefined -> inherit from parent level
  - empty string -> explicitly no prefix (stops cascade)
  - "auto" -> derive [identity.name] from routed agent

Changes:
  - Core logic: resolveResponsePrefix() in identity.ts accepts
    optional channel/accountId and walks the cascade
  - resolveEffectiveMessagesConfig() passes channel context through
  - Types: responsePrefix added to WhatsApp, Telegram, Discord, Slack,
    Signal, iMessage, Google Chat, MS Teams, Feishu, BlueBubbles configs
  - Zod schemas: responsePrefix added for config validation
  - All channel handlers wired: telegram, discord, slack, signal,
    imessage, line, heartbeat runner, route-reply, native commands
  - 23 new tests covering backward compat, channel/account levels,
    full cascade, auto keyword, empty string stops, unknown fallthrough

Fully backward compatible - no existing config is affected.
Fixes #8857

* fix: address CI lint + review feedback

- Replace Record<string, any> with proper typed helpers (no-explicit-any)
- Add curly braces to single-line if returns (eslint curly)
- Fix JSDoc: 'Per-channel' → 'channel/account' on shared config types
- Extract getChannelConfig() helper for type-safe dynamic key access

* fix: finish responsePrefix overrides (#9001) (thanks @mudrii)

* fix: normalize prefix wiring and types (#9001) (thanks @mudrii)

---------

Co-authored-by: Gustavo Madeira Santana <gumadeiras@gmail.com>

extensions/googlechat/src/monitor.ts

@@ -1,6 +1,6 @@
 import type { IncomingMessage, ServerResponse } from "node:http";
 import type { OpenClawConfig } from "openclaw/plugin-sdk";
-import { resolveMentionGatingWithBypass } from "openclaw/plugin-sdk";
+import { createReplyPrefixOptions, resolveMentionGatingWithBypass } from "openclaw/plugin-sdk";
 import type {
   GoogleChatAnnotation,
   GoogleChatAttachment,
@@ -725,10 +725,18 @@ async function processMessageWithPipeline(params: {
     }
   }
 
+  const { onModelSelected, ...prefixOptions } = createReplyPrefixOptions({
+    cfg: config,
+    agentId: route.agentId,
+    channel: "googlechat",
+    accountId: route.accountId,
+  });
+
   await core.channel.reply.dispatchReplyWithBufferedBlockDispatcher({
     ctx: ctxPayload,
     cfg: config,
     dispatcherOptions: {
+      ...prefixOptions,
       deliver: async (payload) => {
         await deliverGoogleChatReply({
           payload,
@@ -749,6 +757,9 @@ async function processMessageWithPipeline(params: {
         );
       },
     },
+    replyOptions: {
+      onModelSelected,
+    },
   });
 }