refactor(web): migrate from Next.js to Vite + React Router (#2102)

* refactor(web): migrate from Next.js to Vite + React Router

* fix: update build pipelines for Vite migration (out → dist)

- Dockerfile: npm run build → npx vite build, web/out → web/dist
- pyproject.toml: package-data web/out/** → web/dist/**
- paths.py: support both web/dist (Vite) and web/out (legacy) with fallback

* fix: remove .next from git tracking, add to .gitignore

1334 cached files from web/.next/ were accidentally committed.
Added .next/ to both root and web/.gitignore.

* fix: update build process to use Vite and correct output directory

* fix: update pnpm-lock.yaml and eslint config for Vite migration

* style: fix prettier formatting issues

* fix: add eslint-plugin-react-hooks for Vite migration

* fix: remove undefined eslint rule reference, downgrade react-hooks plugin to v5

* fix(web): clean up remaining Next.js artifacts in Vite migration

- Add vite-env.d.ts for import.meta.env and asset type declarations
- Remove dead layout.tsx (providers already in main.tsx)
- Fix useSearchParams destructuring to [searchParams] tuple (11 locations)
- Replace process.env.NEXT_PUBLIC_* with import.meta.env.VITE_*
- Fix langbotIcon.src to langbotIcon (Vite returns URL string)
- Fix Link href to Link to for react-router-dom
- Fix navigate({ scroll: false }) to { preventScrollReset: true }
- Fix [router] dependency arrays to [navigate]
- Remove Next.js plugin from tsconfig, set rsc: false in components.json
- Replace next lint with eslint in lint-staged

* 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

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

This reverts commit 3c637fc563.

web/src/app/home/mcp/MCPDetailContent.tsx

@@ -1,7 +1,5 @@
-'use client';
-
 import { useState, useEffect, useCallback, useRef } from 'react';
-import { useRouter } from 'next/navigation';
+import { useNavigate } from 'react-router-dom';
 import { Button } from '@/components/ui/button';
 import { Switch } from '@/components/ui/switch';
 import { Label } from '@/components/ui/label';
@@ -30,7 +28,7 @@ import { toast } from 'sonner';
 
 export default function MCPDetailContent({ id }: { id: string }) {
   const isCreateMode = id === 'new';
-  const router = useRouter();
+  const navigate = useNavigate();
   const { t } = useTranslation();
   const { refreshMCPServers, mcpServers, setDetailEntityName } =
     useSidebarData();
@@ -96,12 +94,12 @@ export default function MCPDetailContent({ id }: { id: string }) {
 
   function handleServerDeleted() {
     refreshMCPServers();
-    router.push('/home/mcp');
+    navigate('/home/mcp');
   }
 
   function handleNewServerCreated(serverName: string) {
     refreshMCPServers();
-    router.push(`/home/mcp?id=${encodeURIComponent(serverName)}`);
+    navigate(`/home/mcp?id=${encodeURIComponent(serverName)}`);
   }
 
   function confirmDelete() {

web/src/app/home/mcp/components/mcp-form/MCPForm.tsx

@@ -1,5 +1,3 @@
-'use client';
-
 import React, {
   useState,
   useEffect,

web/src/app/home/mcp/page.tsx

@@ -1,12 +1,10 @@
-'use client';
-
-import { useSearchParams } from 'next/navigation';
+import { useSearchParams } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import MCPDetailContent from './MCPDetailContent';
 
 export default function MCPPage() {
   const { t } = useTranslation();
-  const searchParams = useSearchParams();
+  const [searchParams] = useSearchParams();
   const detailId = searchParams.get('id');
 
   if (detailId) {