feat: add typed API modules for all backend domains

[helseaCat]

Description

Add typed API modules for all four backend domains — contracts, expectations, tasks, and payloads/deviations.

Changes

• src/api/contracts.ts — list, getById, create, update, publish, listPublished
• src/api/expectations.ts — list, listByContract, getById, create, update, activate, deactivate
• src/api/tasks.ts — list (with status filter), getById, create, transitionStatus
• src/api/payloads.ts — list by contract, getById, submit, getDeviations, listDeviationsByContract

Testing done

• npx tsc --noEmit passes
• All API functions are fully typed with request/response generics

Checklist

• No new warnings
• Self-reviewed

Summary by CodeRabbit

• New Features
  • Integrated backend API support for contracts, expectations, payloads, and task management
  • Enables full lifecycle operations including creation, updates, publishing, and retrieval
  • Supports activation/deactivation controls, status transitions, and deviation tracking across all modules

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 5524fb4a-3f02-438a-8c14-b85ba019a1cb

📥 Commits

Reviewing files that changed from the base of the PR and between c092801 and 1c273b3.

📒 Files selected for processing (4)

• nexus-frontend/src/api/contracts.ts
• nexus-frontend/src/api/expectations.ts
• nexus-frontend/src/api/payloads.ts
• nexus-frontend/src/api/tasks.ts

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📝 Walkthrough

Walkthrough

Introduces four independent frontend API wrapper modules for contracts, expectations, payloads, and tasks. Each module exports a typed object with methods that wrap apiClient calls to REST endpoints and return parsed response data, following consistent patterns across all domains.

Changes

Frontend API Wrappers

Layer / File(s)	Summary
Contracts and Expectations API wrappers nexus-frontend/src/api/contracts.ts, nexus-frontend/src/api/expectations.ts	contractsApi provides CRUD operations plus publish for contracts. expectationsApi provides CRUD, listByContract, and activate/deactivate for expectation state transitions, all calling typed REST endpoints.
Payloads and Tasks API wrappers nexus-frontend/src/api/payloads.ts, nexus-frontend/src/api/tasks.ts	payloadsApi wraps list, get, and submit operations for payloads and their deviations. tasksApi defines TaskListParams with optional status filtering and provides list, get, create, and transitionStatus methods for tasks.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• helseaCat/Project-Nexus#25: Introduces domain and request/response TypeScript types that these new API wrapper methods consume and reference.
• helseaCat/Project-Nexus#26: Implements the shared apiClient foundation that all these new API wrappers call and depend upon.

Poem

🐰 Four APIs hopping in to play,
Contracts and tasks are here to stay,
Each wrapper method calls the REST,
Type-safe queries—the very best!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding multiple typed API wrapper modules for different backend domains (contracts, expectations, tasks, payloads).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/frontend-api-modules

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