Test/resume parser mock integration

[pari7maheshwari]

Description

Implemented isolated mock integration tests for lib/resume-parser.ts using Vitest to fulfill the "Asynchronous Service Layer Mocking & Local Cache Stubs" requirements.

• Used vi.mock() to intercept and stub the asynchronous cache and database service layers.
• Simulated pending states, fallback procedures for timeouts, and cache-write on success callbacks.
• Included a stability test passing an empty buffer into the actual parseResume function to ensure the core regex logic fails safely without crashing the CI pipeline.
• Applied strict TypeScript interfaces to resolve ESLint @typescript-eslint/no-explicit-any and unused variable warnings.

Fixes #2881

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Backend Testing & Mock Integrations)

Visual Preview

N/A — Backend test coverage and CI pipeline stability improvements only.*

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (localhost:3000/api/streak?user=YOUR_USERNAME).
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• My commits follow the Conventional Commits format (e.g., test(parser): add mock integration tests).
• I have updated README.md if I added a new theme or URL parameter.
• I have started the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts).
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

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