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/entities/api/index.ts

@@ -465,3 +465,18 @@ export interface MCPTool {
   description: string;
   parameters?: object;
 }
+
+export interface PluginTool {
+  name: string;
+  description: string;
+  human_desc: string;
+  parameters: object;
+}
+
+export interface ApiRespTools {
+  tools: PluginTool[];
+}
+
+export interface ApiRespToolDetail {
+  tool: PluginTool;
+}