refactor(api): remove MCP marketplace cache integration

Removed dependencies on MCPCacheRepository and PulseMCPService from MCP routes to simplify installation and listing logic, avoiding reliance on potentially stale cached data and streamlining the codebase. Updated available-for-chat filter to include MCPs without explicit status.

components/mcp/MCPManualInstallModal.tsx

@@ -154,9 +154,9 @@ export function MCPManualInstallModal({
               How to use
             </h3>
             <p className="text-sm text-blue-700 dark:text-blue-300 mb-3">
-              Paste your MCP server configuration in Claude Desktop format
-              (claude_desktop_config.json). You can install custom MCPs or MCPs
-              not available in the marketplace.
+              Cole a configuração do servidor MCP no formato do Claude Desktop
+              (claude_desktop_config.json). Apenas instalação manual é suportada
+              neste projeto.
             </p>
             <button
               onClick={handlePasteExample}
@@ -273,7 +273,7 @@ export function MCPManualInstallModal({
           {error && (
             <div className="bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 rounded-lg p-4">
               <div className="flex items-start gap-2">
-                <AlertCircle className="h-5 w-5 text-red-500 flex-shrink-0 mt-0.5" />
+                <AlertCircle className="h-5 w-5 text-red-500 shrink-0 mt-0.5" />
                 <div className="flex-1">
                   <h4 className="font-medium text-red-900 dark:text-red-100">
                     Installation Error