🏹 feat: Concurrent MCP Initialization Support (#8677)

* ✨ feat: Enhance MCP Connection Status Management

- Introduced new functions to retrieve and manage connection status for multiple MCP servers, including OAuth flow checks and server-specific status retrieval.
- Refactored the MCP connection status endpoints to support both all servers and individual server queries.
- Replaced the old server initialization hook with a new `useMCPServerManager` hook for improved state management and handling of multiple OAuth flows.
- Updated the MCPPanel component to utilize the new context provider for better state handling and UI updates.
- Fixed a number of UI bugs when initializing servers

* 🗣️ i18n: Remove unused strings from translation.json

* refactor: move helper functions out of the route module into mcp service file

* ci: add tests for newly added functions in mcp service file

* fix: memoize setMCPValues to avoid render loop

client/src/locales/en/translation.json

@@ -857,13 +857,11 @@
   "com_ui_mcp_not_authenticated": "{{0}} not authenticated (OAuth Required)",
   "com_ui_mcp_not_initialized": "{{0}} not initialized",
   "com_ui_mcp_oauth_cancelled": "OAuth login cancelled for {{0}}",
-  "com_ui_mcp_oauth_no_url": "OAuth authentication required but no URL provided",
   "com_ui_mcp_oauth_timeout": "OAuth login timed out for {{0}}",
   "com_ui_mcp_server_not_found": "Server not found.",
   "com_ui_mcp_servers": "MCP Servers",
   "com_ui_mcp_update_var": "Update {{0}}",
   "com_ui_mcp_url": "MCP Server URL",
-  "com_ui_mcp_init_cancelled": "MCP server '{{0}}' initialization was cancelled due to simultaneous request",
   "com_ui_medium": "Medium",
   "com_ui_memories": "Memories",
   "com_ui_memories_allow_create": "Allow creating Memories",