refactor: split agent.go into 12 files + add mcp_restart_server tool

docs/en/ARCHITECTURE.md

@@ -256,7 +256,7 @@ VM built-ins: `json.encode` / `json.decode` / `log` / `http_get` / `http_post`.
 | Built-in | `init()` → `RegisterFactory` | `internal/plugins/` compiled into kernel | webui/cli/timer/mcp etc. |
 | External `.so` | C ABI dynamic loading | `-buildmode=c-shared` + bridge | qq/files/web/memo etc. |
 | Lua script plugin | Parse `main.lua` to register tools | No compilation, hot-reload | luaplugintest/testlua etc. |
-| SKILL plugin | Parse `SKILL.md` | Markdown definition | OpenClaw compatible |
+| SKILL plugin | Parse `SKILL.md` | Markdown definition | Loaded via clawhubadapter |
 
 Built-in plugin registration: `internal/plugins/all.go` blank imports → each plugin `init()` → `Registry.Load()` scans directory to match factory.
 External plugin loading: `internal/plugin/dynamic.go` → copy to SHA256 temp path (bypass `plugin.Open` path cache) → `Open` + `Lookup("NewPlugin")`.
@@ -403,10 +403,12 @@ internal/
 │   ├── timer/             — Timer
 │   ├── cmd/               — Command execution
 │   ├── mcp/               — MCP protocol
-│   ├── openclaw/          — OpenClaw compatible
+│   ├── files/             — File operations
+│   ├── clawhubadapter/   — ClawHub adapter (OC plugin/SKILL/JS/Python sidecar)
 │   ├── agentcli/          — PTY terminal
 │   ├── healthcheck/       — Health check
-│   └── pluginmgr/         — Plugin manager
+│   ├── pluginmgr/         — Plugin manager
+│   └── cfgmgr/            — Config manager
 ├── sdk/                   — PluginSDK definitions
 │   ├── plugin.go          — Plugin interface + PluginSDK
 │   ├── memory.go          — MemoryAPI

docs/en/OVERVIEW.md

@@ -69,12 +69,19 @@ Code is in the project root, implemented in Go.
 - OpenAI API-compatible `/v1/chat/completions` endpoint
 - SSE event stream `/api/v1/chat/events`
 
+**ClawHub Adapter** (`internal/plugins/clawhubadapter/`):
+- Unified loader for OC plugins (Node.js), Python sidecar, JS sidecar, and SKILL plugins
+- RegistryDispatcher pattern: routes registration notifications to Tool/Provider/Channel/Stage registries
+- ClawHub marketplace search and install: `clawhubadapter_search` / `clawhubadapter_npm_install`
+- 9 provider types mapped to LLM-accessible tools (image generation, web search, speech, etc.)
+- OC channels auto-registered as IO devices with text/file/image/audio capability flags
+
 <img src="../../branding/mascot-xiaozhai.webp" width="20" style="border-radius:50%;vertical-align:middle"> :
 
 ## Project Status
 
 Core functionality is operational. Plugin system and SDK are ready for independent external plugin development.
 
-- Built-in plugins: webui / cli / timer / cmd / mcp / agentcli / healthcheck / pluginmgr / openclaw / files
+- Built-in plugins: webui / cli / timer / cmd / mcp / agentcli / healthcheck / pluginmgr / clawhubadapter / files / cfgmgr
 - External plugin examples ([homeagent-sdk](https://gitcode.com/JianFeeeee/homeagent-sdk) repo `example/`, both Go and Lua types): qq / files / web / memo / bili / editdoc / a2a / ocr / sanitizer / luaplugintest / testlua
 - Distribution: `.hmap` plugin package format, installable via WebUI