feat: add tools API endpoint and tools-selector form type (#2103)

* feat: add tools API endpoint and tools-selector form type

Backend:
- Add GET /api/v1/tools — list all available tools (plugin + MCP)
- Add GET /api/v1/tools/<tool_name> — get specific tool details

Frontend:
- Add TOOLS_SELECTOR form type for plugin config forms
- Multi-select dialog with tool name and description
- Add PluginTool entity type and API client methods

* fix: remove unused quart import, fix prettier formatting

* style: ruff format tools.py

* chore: bump langbot-plugin to 0.3.7

web/src/app/infra/http/BackendClient.ts

@@ -41,6 +41,8 @@ import {
   ApiRespKnowledgeEngines,
   ApiRespParsers,
   RagMigrationStatusResp,
+  ApiRespTools,
+  ApiRespToolDetail,
 } from '@/app/infra/entities/api';
 import { Plugin } from '@/app/infra/entities/plugin';
 import { GetBotLogsRequest } from '@/app/infra/http/requestParam/bots/GetBotLogsRequest';
@@ -649,6 +651,16 @@ export class BackendClient extends BaseHttpClient {
     return this.get('/api/v1/mcp/servers');
   }
 
+  // ========== Tools ==========
+
+  public getTools(): Promise<ApiRespTools> {
+    return this.get('/api/v1/tools');
+  }
+
+  public getToolDetail(toolName: string): Promise<ApiRespToolDetail> {
+    return this.get(`/api/v1/tools/${toolName}`);
+  }
+
   public getMCPServer(serverName: string): Promise<ApiRespMCPServer> {
     return this.get(`/api/v1/mcp/servers/${serverName}`);
   }