Initial scaffold: Researcher Endorsement frontend

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/skills/service-interceptor/SKILL.md

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+---
+name: service-interceptor
+description: "Creates API service wrappers that simulate network calls with artificial delays and error rates for robust UI testing (no backend required)."
+license: MIT
+triggers:
+  - "create api service"
+  - "mock fetch calls"
+  - "simulate network delay"
+---
+
+# Service Interceptor
+
+When to use this skill
+
+- Use when UI needs to consume an API-like interface while the backend is absent.
+- Triggered by prompts to mock axios/fetch behavior or to add latency/failure simulation.
+
+Instructions
+
+1. First Step: Implement `src/services/api.ts` exporting functions (`getPapers`, `getPaperById`, `searchPapers`) that return Promises and optionally use `setTimeout` to simulate delay.
+
+2. Second Step: Make the delay configurable; expose a `setMockDelay(ms)` helper and an optional `errorRate` flag for testing error states.
+
+3. Third Step: Use mockData fixtures as response payloads and ensure the services return the same shape as a future real API.
+
+Examples
+
+- `await api.getPapers({ page: 1, pageSize: 10 }) // resolves after 300ms with { items, total }`
+
+Notes
+
+- Document how to switch to a real API endpoint later by replacing the service implementation or toggling an environment variable.