fix: stale types test and unreachable ralph full-reset API path

- Remove tests for createSuccessResponse and ErrorMessages which were
  removed/made private during the type system refactoring (15 failures)
- Fix RalphConfigSchema to accept 'full' string for reset field,
  matching the route handler's fullReset() code path

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/web/schemas.ts

@@ -343,7 +343,7 @@ export const RalphConfigSchema = z.object({
   enabled: z.boolean().optional(),
   completionPhrase: z.string().max(500).optional(),
   maxIterations: z.number().int().min(0).max(10000).optional(),
-  reset: z.boolean().optional(),
+  reset: z.union([z.boolean(), z.literal('full')]).optional(),
   disableAutoEnable: z.boolean().optional(),
 });