Add dynamic route matching and validation improvements

Introduces dynamic route parameter support in route path computation and schema matching. Adds a utility for sending validation errors, updates schema definitions to support header validation, and refactors server middleware to handle header, body, and query validation with improved error handling. Also adds a placeholder user route and updates dependencies to include 'path-to-regexp'.

package.json

@@ -25,6 +25,7 @@
 		"colors": "^1.4.0",
 		"dotenv": "^17.2.3",
 		"express": "^5.2.1",
+		"path-to-regexp": "^8.3.0",
 		"zod": "^4.2.0"
 	},
 	"devDependencies": {