refactor(config): make config.Channel to multiple instance support

add new field type to Channel struct
config.channels refactor to channel_list
update config version to 3
update the docs

docs/chat-apps.md

@@ -40,9 +40,10 @@ Talk to your picoclaw through Telegram, Discord, WhatsApp, Matrix, QQ, DingTalk,
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "telegram": {
       "enabled": true,
+      "type": "telegram",
       "token": "YOUR_BOT_TOKEN",
       "allow_from": ["YOUR_USER_ID"],
       "use_markdown_v2": false
@@ -101,9 +102,10 @@ You can set use_markdown_v2: true to enable enhanced formatting options. This al
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "discord": {
       "enabled": true,
+      "type": "discord",
       "token": "YOUR_BOT_TOKEN",
       "allow_from": ["YOUR_USER_ID"]
     }
@@ -124,7 +126,7 @@ By default the bot responds to all messages in a server channel. To restrict res
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "discord": {
       "group_trigger": { "mention_only": true }
     }
@@ -136,7 +138,7 @@ You can also trigger by keyword prefixes (e.g. `!bot`):
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "discord": {
       "group_trigger": { "prefixes": ["!bot"] }
     }
@@ -165,9 +167,10 @@ PicoClaw can connect to WhatsApp in two ways:
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "whatsapp": {
       "enabled": true,
+      "type": "whatsapp",
       "use_native": true,
       "session_store_path": "",
       "allow_from": []
@@ -199,9 +202,10 @@ Scan the printed QR code with your WeChat mobile app. On success, the token is s
 (Optional) Update `allow_from` with your WeChat User ID to restrict who can message the bot:
 ```json
 {
-  "channels": {
+  "channel_list": {
     "weixin": {
       "enabled": true,
+      "type": "weixin",
       "token": "YOUR_TOKEN",
       "allow_from": ["YOUR_USER_ID"]
     }
@@ -230,9 +234,10 @@ QQ Open Platform provides a one-click setup page for OpenClaw-compatible bots:
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "qq": {
       "enabled": true,
+      "type": "qq",
       "app_id": "YOUR_APP_ID",
       "app_secret": "YOUR_APP_SECRET",
       "allow_from": []
@@ -272,9 +277,10 @@ If you prefer to create the bot manually:
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "dingtalk": {
       "enabled": true,
+      "type": "dingtalk",
       "client_id": "YOUR_CLIENT_ID",
       "client_secret": "YOUR_CLIENT_SECRET",
       "allow_from": []
@@ -305,9 +311,10 @@ picoclaw gateway
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "matrix": {
       "enabled": true,
+      "type": "matrix",
       "homeserver": "https://matrix.org",
       "user_id": "@your-bot:matrix.org",
       "access_token": "YOUR_MATRIX_ACCESS_TOKEN",
@@ -341,9 +348,10 @@ For full options (`device_id`, `join_on_invite`, `group_trigger`, `placeholder`,
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "line": {
       "enabled": true,
+      "type": "line",
       "channel_secret": "YOUR_CHANNEL_SECRET",
       "channel_access_token": "YOUR_CHANNEL_ACCESS_TOKEN",
       "webhook_path": "/webhook/line",
@@ -399,9 +407,10 @@ This command shows a QR code, waits for approval in WeCom, and writes `bot_id` +
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "wecom": {
       "enabled": true,
+      "type": "wecom",
       "bot_id": "YOUR_BOT_ID",
       "secret": "YOUR_SECRET",
       "websocket_url": "wss://openws.work.weixin.qq.com",
@@ -440,9 +449,10 @@ PicoClaw connects to Feishu via WebSocket/SDK mode — no public webhook URL or
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "feishu": {
       "enabled": true,
+      "type": "feishu",
       "app_id": "cli_xxx",
       "app_secret": "YOUR_APP_SECRET",
       "allow_from": []
@@ -480,9 +490,10 @@ For full options, see [Feishu Channel Configuration Guide](channels/feishu/READM
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "slack": {
       "enabled": true,
+      "type": "slack",
       "bot_token": "xoxb-YOUR-BOT-TOKEN",
       "app_token": "xapp-YOUR-APP-TOKEN",
       "allow_from": []
@@ -507,9 +518,10 @@ picoclaw gateway
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "irc": {
       "enabled": true,
+      "type": "irc",
       "server": "irc.libera.chat:6697",
       "tls": true,
       "nick": "picoclaw-bot",
@@ -547,9 +559,10 @@ Install and run a OneBot v11 compatible QQ bot framework. Enable its WebSocket s
 
 ```json
 {
-  "channels": {
+  "channel_list": {
     "onebot": {
       "enabled": true,
+      "type": "onebot",
       "ws_url": "ws://127.0.0.1:8080",
       "access_token": "",
       "allow_from": []