✨ feat: Add MCP Reinitialization to MCPPanel (#8418)

* ✨ feat: Add MCP Reinitialization to MCPPanel

- Refactored tool caching to include user-specific tools in various service files.
- Refactored MCPManager class for clarity
- Added a new endpoint for reinitializing MCP servers, allowing for dynamic updates of server configurations.
- Enhanced the MCPPanel component to support server reinitialization with user feedback.

* 🔃 refactor: Simplify Plugin Deduplication and Clear Cache Post-MCP Initialization

- Replaced manual deduplication of tools with the dedicated `filterUniquePlugins` function for improved readability.
- Added back cache clearing for tools after MCP initialization to ensure fresh data is used.
- Removed unused exports from `PluginController.js` to clean up the codebase.

api/server/services/initializeMCP.js

@@ -1,56 +0,0 @@
-const { logger } = require('@librechat/data-schemas');
-const { CacheKeys } = require('librechat-data-provider');
-const { findToken, updateToken, createToken, deleteTokens } = require('~/models');
-const { getMCPManager, getFlowStateManager } = require('~/config');
-const { getCachedTools, setCachedTools } = require('./Config');
-const { getLogStores } = require('~/cache');
-
-/**
- * Initialize MCP servers
- * @param {import('express').Application} app - Express app instance
- */
-async function initializeMCP(app) {
-  const mcpServers = app.locals.mcpConfig;
-  if (!mcpServers) {
-    return;
-  }
-
-  logger.info('Initializing MCP servers...');
-  const mcpManager = getMCPManager();
-  const flowsCache = getLogStores(CacheKeys.FLOWS);
-  const flowManager = flowsCache ? getFlowStateManager(flowsCache) : null;
-
-  try {
-    await mcpManager.initializeMCP({
-      mcpServers,
-      flowManager,
-      tokenMethods: {
-        findToken,
-        updateToken,
-        createToken,
-        deleteTokens,
-      },
-    });
-
-    delete app.locals.mcpConfig;
-    const availableTools = await getCachedTools();
-
-    if (!availableTools) {
-      logger.warn('No available tools found in cache during MCP initialization');
-      return;
-    }
-
-    const toolsCopy = { ...availableTools };
-    await mcpManager.mapAvailableTools(toolsCopy, flowManager);
-    await setCachedTools(toolsCopy, { isGlobal: true });
-
-    const cache = getLogStores(CacheKeys.CONFIG_STORE);
-    await cache.delete(CacheKeys.TOOLS);
-    logger.debug('Cleared tools array cache after MCP initialization');
-    logger.info('MCP servers initialized successfully');
-  } catch (error) {
-    logger.error('Failed to initialize MCP servers:', error);
-  }
-}
-
-module.exports = initializeMCP;