feat(error-handling): Implement comprehensive gateway error handling with user-friendly messages

- Add comprehensive gateway error handler with friendly user messages
- Handle subscription status errors (inactive BYOK, subscription required)
- Handle authentication errors (invalid API keys, missing tokens)
- Handle rate limiting with retry suggestions
- Handle model availability and validation errors
- Handle network connectivity issues
- Provide actionable solutions for each error type
- Prevent duplicate error messages by returning early after showing friendly error
- Fix telemetry tests to use correct environment variable names (TASKMASTER_API_KEY)
- Fix config manager getUserId function to properly save default userId to file
- All tests now passing (34 test suites, 360 tests)

package-lock.json

@@ -45,7 +45,8 @@
 				"ora": "^8.2.0",
 				"task-master-ai": "^0.15.0",
 				"uuid": "^11.1.0",
-				"zod": "^3.23.8"
+				"zod": "^3.23.8",
+				"zod-to-json-schema": "^3.24.5"
 			},
 			"bin": {
 				"task-master": "bin/task-master.js",