feat: add DSH plugin marketplace and shared MCP

GoodBuddy could share Skills across runtimes, but custom MCP remained limited and DeepSeek Harness could not manage third-party extensions. The app now provides a default-off DSH npm marketplace with managed installation, configuration, failure isolation, and packaged npm support, while assigned custom MCP is available to managed OpenCode, Continue Agent, and DeepSeek Harness in Execute.

Third-party DSH install scripts, initialization, and tools run with the current user's permissions. Ask remains read-only at dispatch, and turning off the marketplace hides management without disabling installed plugins.

Release note: 新增默认关闭的 DSH 插件市场，并让自定义 MCP 可分配给 OpenCode、Continue 和 DeepSeek Harness；安装第三方插件前会明确提示当前用户权限边界。

src/main/agent/continue-host-adapter.ts

@@ -54,6 +54,7 @@ const maximumStreamEvents = 5_000
 const maximumStreamEventBytes = 2 * 1024 * 1024
 const maximumExecutionMilliseconds = 10 * 60_000
 const knowledgeMcpName = 'goodbuddy-knowledge'
+const customMcpName = 'goodbuddy-custom-mcp'
 export const continueConfigurationRequiredMessage =
   'Continue 尚未配置模型连接，请在设置中选择 GoodBuddy 模型连接或指定 Continue 配置文件'
 const utilityBootstrap = [
@@ -200,6 +201,10 @@ export type ContinueHostRunOptions = {
     endpoint: string
     token: string
   }
+  customMcpCapability?: {
+    endpoint: string
+    token: string
+  }
   onEvent?: (event: ContinueHostStreamEvent) => void | Promise<void>
 }
 
@@ -207,11 +212,12 @@ type KnowledgeCapability = NonNullable<
   ContinueHostRunOptions['knowledgeCapability']
 >
 
-function createKnowledgeMcpServer(
+function createLoopbackMcpServer(
+  name: string,
   capability: KnowledgeCapability
 ): Record<string, unknown> {
   return {
-    name: knowledgeMcpName,
+    name,
     type: 'streamable-http',
     url: capability.endpoint,
     requestOptions: {
@@ -914,8 +920,35 @@ export class ContinueHostAdapter {
     runOptions: ContinueHostRunOptions
   ): Promise<string | undefined> {
     const knowledgeCapability = runOptions.knowledgeCapability
+    const customMcpCapability = runOptions.customMcpCapability
+    if (
+      customMcpCapability &&
+      runOptions.workMode !== 'execute'
+    ) {
+      throw new Error(
+        'Continue 自定义 MCP 仅允许在 Agent Execute 模式使用'
+      )
+    }
+    const capabilityServers = [
+      ...(knowledgeCapability
+        ? [
+            createLoopbackMcpServer(
+              knowledgeMcpName,
+              knowledgeCapability
+            )
+          ]
+        : []),
+      ...(customMcpCapability
+        ? [
+            createLoopbackMcpServer(
+              customMcpName,
+              customMcpCapability
+            )
+          ]
+        : [])
+    ]
     if (!this.options.modelProfile) {
-      if (!knowledgeCapability) {
+      if (capabilityServers.length === 0) {
         return undefined
       }
       const configured = await loadContinueConfig(
@@ -942,10 +975,14 @@ export class ContinueHostAdapter {
           : servers.filter(
               (server) =>
                 !isRecord(server) ||
-                server.name !== knowledgeMcpName
+                (
+                  server.name !== knowledgeMcpName &&
+                  server.name !== customMcpName
+                )
             )
       if (
-        retainedServers.length >= maximumConfiguredMcpServers
+        retainedServers.length + capabilityServers.length >
+        maximumConfiguredMcpServers
       ) {
         throw new Error(
           `Continue 配置文件中的 MCP Server 不能超过 ${maximumConfiguredMcpServers} 个`
@@ -955,7 +992,7 @@ export class ContinueHostAdapter {
         ...configured,
         mcpServers: [
           ...retainedServers,
-          createKnowledgeMcpServer(knowledgeCapability)
+          ...capabilityServers
         ]
       })
     }
@@ -994,11 +1031,9 @@ export class ContinueHostAdapter {
       version: '1.0.0',
       schema: 'v1',
       models: [modelConfig],
-      ...(knowledgeCapability
+      ...(capabilityServers.length > 0
         ? {
-            mcpServers: [
-              createKnowledgeMcpServer(knowledgeCapability)
-            ]
+            mcpServers: capabilityServers
           }
         : {})
     })