chore(api): remove unused backend endpoints after MCP audit

Remove legacy backend routes that no longer have frontend or internal
callers, including the old Claude/Codex MCP APIs, unused Cursor and Codex
helper endpoints, stale TaskMaster detection/next/initialize routes,
and unused command/project helpers.

This reduces duplicated MCP behavior now handled by the provider-based
MCP API, shrinks the exposed backend surface, and removes probe/service
code that only existed for deleted endpoints.

Add an MCP settings API audit document to capture the route-usage
analysis and explain why the legacy MCP endpoints were considered safe
to remove.

server/utils/mcp-detector.js

@@ -145,54 +145,3 @@ export async function detectTaskMasterMCPServer() {
     }
 }
 
-/**
- * Get all configured MCP servers (not just TaskMaster)
- * @returns {Promise<Object>} All MCP servers configuration
- */
-export async function getAllMCPServers() {
-    try {
-        const homeDir = os.homedir();
-        const configPaths = [
-            path.join(homeDir, '.claude.json'),
-            path.join(homeDir, '.claude', 'settings.json')
-        ];
-        
-        let configData = null;
-        let configPath = null;
-        
-        // Try to read from either config file
-        for (const filepath of configPaths) {
-            try {
-                const fileContent = await fsPromises.readFile(filepath, 'utf8');
-                configData = JSON.parse(fileContent);
-                configPath = filepath;
-                break;
-            } catch (error) {
-                continue;
-            }
-        }
-        
-        if (!configData) {
-            return {
-                hasConfig: false,
-                servers: {},
-                projectServers: {}
-            };
-        }
-
-        return {
-            hasConfig: true,
-            configPath,
-            servers: configData.mcpServers || {},
-            projectServers: configData.projects || {}
-        };
-    } catch (error) {
-        console.error('Error getting all MCP servers:', error);
-        return {
-            hasConfig: false,
-            error: error.message,
-            servers: {},
-            projectServers: {}
-        };
-    }
-}