Build a gocron API feature

Keep the route, authorization rule, handler, frontend client, types, translations, documentation, and tests as one change.

Compatibility invariants

• When the contract changes, preserve both deployment orders: an N frontend/client must tolerate an N-1 backend, and an N backend must serve N-1 frontends/clients.
• Keep routes, methods, accepted requests, response fields and types, status codes, pagination, and SSE event contracts stable. New response fields must be optional; new request fields must have compatible defaults.
• Detect new server capabilities before depending on them. If N-1 lacks an endpoint, field, or stream behavior, retain a safe legacy path or hide it.
• Never repurpose an existing field or error code. Breaking contracts require explicit approval, a major version, and migration/rollout/rollback plans.

Performance invariants

• Bound every collection response and expensive input. Require pagination, maximum page sizes, upload/body limits, and bounded filters where applicable.
• Prevent N+1 queries and per-row remote calls. Capture query counts for list endpoints and inspect query plans for new filters, sorting, or joins.
• For polling and SSE, bound connection/resource use, clean up on disconnect, avoid per-client database polling where sharing is safe, and apply backpressure or a documented drop/coalescing policy.
• Do not return or retain unbounded task output/logs. Use paging, cursors, bounded chunks, or streaming with cancellation.
• Benchmark materially affected high-traffic or high-volume endpoints with representative data and report applicable metrics.

Trace the existing path

• Inspect neighboring registrations in internal/routers/routers.go, handlers under internal/routers, models/services called by the handler, and the matching frontend module under web/gocronx-admin/src/api.
• Identify every middleware applied to the route group. Classify the endpoint as public, authenticated, admin-only, API-token accessible, or agent-facing.
• Search path allowlists and permission maps before adding a route. Never make an endpoint public merely to make a request succeed.
• Preserve the response conventions in internal/routers/base. Do not expose raw database, filesystem, command, provider, or secret errors to clients.

Implement the complete contract

• Use the appropriate HTTP method. Mutating operations must not use GET.
• Bind into an explicit request type, validate required fields and bounds, and reject unknown or dangerous input where the existing API pattern permits.
• Enforce authorization server-side before loading or mutating protected data. For resource ids, verify access to the resource rather than only validating that the caller is logged in.
• Use transactions for multi-write operations. Add an audit event for security-sensitive or administrative mutations following existing patterns.
• Update the frontend API wrapper and src/types/api/api.d.ts when the UI uses the endpoint. Keep backend and frontend field names/types aligned.
• Add both Chinese and English strings when user-visible text changes: backend internal/modules/i18n/{zh_cn,en_us}.go, frontend src/locales/langs/{zh,en}.json.
• Update docs/zh/guide/api.md for a public API contract. Include auth, parameters, example response, error behavior, and compatibility impact.

Test risk, not just success

Add focused tests for:

• valid requests and stable response shape;
• missing, malformed, boundary, and nonexistent-resource input;
• unauthenticated and unauthorized callers;
• ownership or tenant boundary where applicable;
• duplicate submissions or retry behavior for mutations;
• secret/error redaction for sensitive endpoints.
• N-1 requests/responses and both frontend/backend deployment orders when the feature crosses that boundary.

Run the changed router package with race detection, then relevant service/model tests. Run frontend type checking when the contract is consumed by the UI. Finally invoke $verify before committing.

Report the route and method, authorization class, contract changes, backward compatibility, tests added, performance evidence when relevant, and any documentation or i18n files intentionally left unchanged.