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>

src/web/auto-reply/monitor/process-message.ts

@@ -18,7 +18,7 @@ import {
 import { finalizeInboundContext } from "../../../auto-reply/reply/inbound-context.js";
 import { dispatchReplyWithBufferedBlockDispatcher } from "../../../auto-reply/reply/provider-dispatcher.js";
 import { toLocationContext } from "../../../channels/location.js";
-import { createReplyPrefixContext } from "../../../channels/reply-prefix.js";
+import { createReplyPrefixOptions } from "../../../channels/reply-prefix.js";
 import { resolveMarkdownTableMode } from "../../../config/markdown-tables.js";
 import {
   readSessionUpdatedAt,
@@ -255,16 +255,18 @@ export async function processMessage(params: {
     ? await resolveWhatsAppCommandAuthorized({ cfg: params.cfg, msg: params.msg })
     : undefined;
   const configuredResponsePrefix = params.cfg.messages?.responsePrefix;
-  const prefixContext = createReplyPrefixContext({
+  const { onModelSelected, ...prefixOptions } = createReplyPrefixOptions({
     cfg: params.cfg,
     agentId: params.route.agentId,
+    channel: "whatsapp",
+    accountId: params.route.accountId,
   });
   const isSelfChat =
     params.msg.chatType !== "group" &&
     Boolean(params.msg.selfE164) &&
     normalizeE164(params.msg.from) === normalizeE164(params.msg.selfE164 ?? "");
   const responsePrefix =
-    prefixContext.responsePrefix ??
+    prefixOptions.responsePrefix ??
     (configuredResponsePrefix === undefined && isSelfChat
       ? (resolveIdentityNamePrefix(params.cfg, params.route.agentId) ?? "[openclaw]")
       : undefined);
@@ -339,8 +341,8 @@ export async function processMessage(params: {
     cfg: params.cfg,
     replyResolver: params.replyResolver,
     dispatcherOptions: {
+      ...prefixOptions,
       responsePrefix,
-      responsePrefixContextProvider: prefixContext.responsePrefixContextProvider,
       onHeartbeatStrip: () => {
         if (!didLogHeartbeatStrip) {
           didLogHeartbeatStrip = true;
@@ -400,7 +402,7 @@ export async function processMessage(params: {
         typeof params.cfg.channels?.whatsapp?.blockStreaming === "boolean"
           ? !params.cfg.channels.whatsapp.blockStreaming
           : undefined,
-      onModelSelected: prefixContext.onModelSelected,
+      onModelSelected,
     },
   });