fix: add fetch timeouts to CodeChef, Codeforces, and GitHub services to prevent stalled requests

[rishab11250]

Description

LeetCode service uses an 8-second AbortController timeout, but CodeChef, Codeforces, GitHub REST, and GitHub GraphQL services use bare fetch() with no timeout. If any of these external APIs hang or respond slowly, the entire profile render stalls until Vercel's 10-second serverless function timeout kills it, returning a broken image to the user.

Affected Services

• src/services/codechef.service.js — no timeout
• src/services/codeforces.service.js — no timeout
• src/services/github.service.js (fetchUserProfile, fetchUserRepos, fetchAvatarDataUri) — no timeout
• src/services/github-graphql.service.js (fetchContributionData) — no timeout

Steps to Reproduce

1. Remove network access (or simulate a slow API)
2. Request a profile with codeforces=true
3. The request hangs for 10s, then returns a broken SVG/error

Suggested Fix

Add AbortController with an 8-second timeout to each fetch() call, matching the existing pattern in leetcode.service.js lines 32-33.

Files to Modify

• src/services/codechef.service.js
• src/services/codeforces.service.js
• src/services/github.service.js
• src/services/github-graphql.service.js

[rishab11250]

Hey @SamXop123, please assign this issue to me so that i can start working on this.

[SamXop123]

Another great issue @rishab11250
Assigned you