fix(config): Improve config-manager.js for MCP server integration

- Fixed MCP server initialization warnings by refactoring config-manager.js to handle missing project roots silently during startup

- Added project root tracking (loadedConfigRoot) to improve config caching and prevent unnecessary reloads

- Modified _loadAndValidateConfig to return defaults without warnings when no explicitRoot provided

- Improved getConfig to only update cache when loading config with a specific project root

- Ensured warning messages still appear when explicitly specified roots have missing/invalid configs

- Prevented console output during MCP startup that was causing JSON parsing errors

- Verified parse_prd and other MCP tools still work correctly with the new config loading approach.

- Replaces test perplexity api key in mcp.json and rolls it. It's invalid now.

scripts/modules/task-manager/models.js

@@ -79,14 +79,14 @@ async function getModelConfiguration(options = {}) {
 
 		// Check API keys
 		const mainCliKeyOk = isApiKeySet(mainProvider);
-		const mainMcpKeyOk = getMcpApiKeyStatus(mainProvider);
+		const mainMcpKeyOk = getMcpApiKeyStatus(mainProvider, projectRoot);
 		const researchCliKeyOk = isApiKeySet(researchProvider);
-		const researchMcpKeyOk = getMcpApiKeyStatus(researchProvider);
+		const researchMcpKeyOk = getMcpApiKeyStatus(researchProvider, projectRoot);
 		const fallbackCliKeyOk = fallbackProvider
 			? isApiKeySet(fallbackProvider)
 			: true;
 		const fallbackMcpKeyOk = fallbackProvider
-			? getMcpApiKeyStatus(fallbackProvider)
+			? getMcpApiKeyStatus(fallbackProvider, projectRoot)
 			: true;
 
 		// Get available models to find detailed info